Fatal Frenzy (Card)

Fatal Frenzy
In 3254 decks 0% of 2474814 decks
Archidekt
Commander Spellbook
Moxfield
Scryfall
MTGStocks
Evereth, Viceroy of Plunder
7.70% of 1921 decks 148 decks
Top Commanders
Juri, Master of the Revue
13.79% of 5410 decks 746 decks
Brion Stoutarm
12.37% of 2968 decks 367 decks
Atogatog
26.89% of 1268 decks 341 decks
Wick, the Whorled Mind
1.91% of 5609 decks 107 decks
Minsc & Boo, Timeless Heroes
1.51% of 6495 decks 98 decks
Mr. Orfeo, the Boulder
3.86% of 1918 decks 74 decks
Ziatora, the Incinerator
0.83% of 8148 decks 68 decks
Varchild, Betrayer of Kjeldor
10.67% of 581 decks 62 decks
Kalamax, the Stormsire
0.85% of 7073 decks 60 decks
Ojer Axonil, Deepest Might
0.64% of 9160 decks 59 decks
Xenagos, God of Revels
0.85% of 5312 decks 45 decks
Zada, Hedron Grinder
0.48% of 7312 decks 35 decks
Atla Palani, Nest Tender
0.22% of 15451 decks 34 decks
Kresh the Bloodbraided
1.11% of 2708 decks 30 decks
Inferno of the Star Mounts
2.43% of 1153 decks 28 decks
Saruman, the White Hand
0.36% of 6475 decks 23 decks
Okaun, Eye of Chaos // Zndrsplt, Eye of Wisdom
0.31% of 6406 decks 20 decks
New Cards
Bulk Up
83% of 232 decks +73% synergy
Infernal Vessel
69% of 13 decks +61% synergy
Infestation Sage
64% of 39 decks +42% synergy
Stab
60% of 5 decks +16% synergy
Quick-Draw Katana
43% of 7 decks +10% synergy
High Synergy Cards
Phantatog
83% of 402 decks +82% synergy
Thaumatog
76% of 440 decks +76% synergy
Psychatog
60% of 557 decks +59% synergy
Fling
55% of 3254 decks +52% synergy
Enchanted Evening
51% of 402 decks +50% synergy
Unleash Fury
51% of 3203 decks +49% synergy
Mayael's Aria
51% of 440 decks +48% synergy
Vren, the Relentless
39% of 173 decks +37% synergy
Eerie Ultimatum
49% of 370 decks +37% synergy
Faith's Reward
36% of 924 decks +36% synergy
Top Cards
Leyline of the Guildpact
57% of 143 decks +34% synergy
Swords to Plowshares
52% of 925 decks -11% synergy
Cultivate
49% of 1057 decks +3% synergy
Farseek
45% of 1059 decks +11% synergy
Mayhem Devil
45% of 1819 decks +35% synergy
Rampant Growth
44% of 1059 decks +10% synergy
Legion Leadership
44% of 215 decks +36% synergy
Kazuul's Fury
44% of 3199 decks +41% synergy
Deadly Dispute
43% of 1792 decks +31% synergy
Kodama's Reach
40% of 1059 decks +9% synergy
Creatures
Unsettled Mariner
37% of 399 decks +35% synergy
Mahadi, Emporium Master
36% of 1761 decks +30% synergy
Morophon, the Boundless
36% of 364 decks +23% synergy
Serra Avatar
36% of 925 decks +35% synergy
Auratog
35% of 925 decks +35% synergy
Mirror Entity
35% of 925 decks +30% synergy
Soul of Eternity
34% of 906 decks +33% synergy
Ruthless Technomancer
33% of 1780 decks +31% synergy
Chronatog
33% of 805 decks +33% synergy
Mirkwood Bats
32% of 1372 decks +20% synergy
Pitiless Plunderer
32% of 1821 decks +24% synergy
Lithatog
32% of 1059 decks +32% synergy
Ashnod the Uncaring
31% of 488 decks +31% synergy
Lagomos, Hand of Hatred
31% of 1722 decks +28% synergy
Gutless Plunderer
31% of 13 decks +9% synergy
Warren Soultrader
28% of 698 decks +20% synergy
Viscera Seer
28% of 1824 decks +18% synergy
Marionette Apprentice
27% of 698 decks +20% synergy
Alesha, Who Laughs at Fate
27% of 196 decks +11% synergy
Foratog
26% of 1059 decks +26% synergy
Chameleon Colossus
26% of 1057 decks +25% synergy
Ashroot Animist
25% of 55 decks +22% synergy
Fain, the Broker
25% of 1805 decks +24% synergy
Callous Sell-Sword
25% of 1239 decks +24% synergy
Yargle and Multani
25% of 415 decks +21% synergy
Reassembling Skeleton
25% of 1824 decks +21% synergy
Ignoble Hierarch
24% of 601 decks -1% synergy
Adarkar Valkyrie
24% of 925 decks +23% synergy
Azure Beastbinder
24% of 152 decks +21% synergy
Birds of Paradise
23% of 1059 decks -4% synergy
Greedy Freebooter
23% of 993 decks +21% synergy
Impulsive Pilferer
23% of 3198 decks +20% synergy
Solemn Simulacrum
22% of 3254 decks +9% synergy
Goblin Anarchomancer
22% of 1024 decks +9% synergy
Taurean Mauler
22% of 3252 decks +19% synergy
Hofri Ghostforge
22% of 897 decks +21% synergy
Sakura-Tribe Elder
22% of 1059 decks +3% synergy
Braids, Arisen Nightmare
20% of 1722 decks +12% synergy
Ertha Jo, Frontier Mentor
20% of 253 decks +19% synergy
Shoreline Looter
20% of 240 decks +17% synergy
Jadar, Ghoulcaller of Nephalia
19% of 1789 decks +17% synergy
Amoeboid Changeling
19% of 804 decks +18% synergy
Rev, Tithe Extractor
19% of 225 decks +14% synergy
Carrion Feeder
19% of 1824 decks +14% synergy
Nykthos Paragon
18% of 890 decks +17% synergy
Sarcatog
18% of 1824 decks +18% synergy
Realm-Cloaked Giant
18% of 912 decks +17% synergy
Eternal Witness
18% of 1059 decks -3% synergy
Evra, Halcyon Witness
18% of 914 decks +18% synergy
Crime Novelist
18% of 1486 decks +14% synergy
Instants
Chaos Warp
36% of 3250 decks +4% synergy
Beast Within
35% of 1057 decks -4% synergy
Soul's Fire
34% of 3251 decks +33% synergy
Counterspell
34% of 805 decks -9% synergy
Berserk
34% of 1059 decks +33% synergy
Second Sunrise
32% of 925 decks +32% synergy
Path to Exile
32% of 924 decks -14% synergy
Withering Torment
31% of 302 decks +12% synergy
Return of the Wildspeaker
28% of 1044 decks +15% synergy
Village Rites
27% of 1814 decks +18% synergy
Generous Gift
25% of 913 decks -0% synergy
Boros Charm
25% of 923 decks +0% synergy
Cosmic Intervention
24% of 905 decks +23% synergy
Terminate
23% of 1824 decks +2% synergy
Big Score
23% of 3091 decks +13% synergy
Growth Spiral
22% of 476 decks -0% synergy
Corrupted Conviction
21% of 1427 decks +15% synergy
Untimely Malfunction
21% of 503 decks +5% synergy
Tainted Strike
20% of 1824 decks +18% synergy
Negate
20% of 804 decks -3% synergy
Rakdos Charm
20% of 1824 decks +5% synergy
Tyvar's Stand
19% of 781 decks +14% synergy
Unexpected Windfall
18% of 3157 decks +11% synergy
Temur Battle Rage
18% of 3246 decks +15% synergy
Harrow
18% of 1059 decks +8% synergy
Malakir Rebirth
17% of 1814 decks +9% synergy
Bedevil
17% of 1820 decks +3% synergy
Fake Your Own Death
17% of 1778 decks +15% synergy
Deflecting Palm
16% of 921 decks +11% synergy
Rush of Blood
16% of 3250 decks +16% synergy
Ram Through
16% of 1043 decks +13% synergy
Heroic Intervention
16% of 1053 decks -14% synergy
Assassin's Trophy
16% of 615 decks -14% synergy
Astarion's Thirst
16% of 1761 decks +15% synergy
Nasty End
16% of 1372 decks +13% synergy
Planar Genesis
16% of 116 decks +8% synergy
Hunter's Insight
15% of 1057 decks +11% synergy
Frantic Search
14% of 805 decks +2% synergy
Costly Plunder
14% of 1821 decks +12% synergy
Wear // Tear
14% of 922 decks +6% synergy
Overprotect
14% of 170 decks +9% synergy
Enlightened Tutor
13% of 925 decks -4% synergy
Fanatical Offering
13% of 993 decks +12% synergy
Brainstorm
13% of 805 decks -8% synergy
Brought Back
13% of 913 decks +12% synergy
Invigorate
13% of 1059 decks +12% synergy
Choose Your Weapon
13% of 1014 decks +12% synergy
Bolt Bend
12% of 3225 decks +9% synergy
Momentous Fall
12% of 1057 decks +10% synergy
Dark Ritual
12% of 1824 decks -10% synergy
Sorceries
Blasphemous Edict
38% of 196 decks +4% synergy
Chandra's Ignition
35% of 3244 decks +30% synergy
Nature's Lore
32% of 1059 decks -0% synergy
Blasphemous Act
31% of 3250 decks -2% synergy
Conflux
28% of 366 decks +24% synergy
Rite of Consumption
27% of 1824 decks +27% synergy
Thud
25% of 3230 decks +25% synergy
Victimize
24% of 1824 decks +12% synergy
Feed the Swarm
23% of 1814 decks +5% synergy
Three Visits
23% of 1059 decks -2% synergy
Rishkar's Expertise
17% of 1053 decks +7% synergy
Blood Money
16% of 1761 decks +14% synergy
Vandalblast
16% of 3250 decks +0% synergy
Jeska's Will
16% of 3198 decks -1% synergy
Phyrexian Rebirth
15% of 924 decks +14% synergy
Seize the Spotlight
15% of 3091 decks +13% synergy
Stump Stomp
15% of 280 decks +6% synergy
Essence Harvest
14% of 1824 decks +13% synergy
Faithless Looting
14% of 3250 decks -3% synergy
Seize the Spoils
13% of 3193 decks +10% synergy
Life's Legacy
13% of 1055 decks +11% synergy
Night's Whisper
12% of 1824 decks +3% synergy
Brass's Bounty
12% of 3234 decks +9% synergy
Diabolic Intent
12% of 1824 decks +3% synergy
Splendid Reclamation
11% of 1053 decks +8% synergy
Sign in Blood
11% of 1824 decks +1% synergy
Circuitous Route
11% of 1050 decks +9% synergy
Demonic Tutor
11% of 1824 decks -11% synergy
Unearth
10% of 1824 decks +7% synergy
Furnace Reins
10% of 2500 decks +10% synergy
Bala Ged Recovery
10% of 1036 decks +1% synergy
Toxic Deluge
10% of 1824 decks -8% synergy
Mana Geyser
10% of 3254 decks +3% synergy
Exponential Growth
10% of 1028 decks +9% synergy
Austere Command
10% of 925 decks -3% synergy
Reanimate
10% of 1824 decks -6% synergy
Pirate's Pillage
9% of 3234 decks +7% synergy
Mob Rule
9% of 3246 decks +8% synergy
Diabolic Tutor
9% of 1824 decks +2% synergy
Secret Rendezvous
9% of 897 decks +6% synergy
Guided Passage
9% of 478 decks +7% synergy
Enter the Enigma
8% of 72 decks +1% synergy
Skyshroud Claim
8% of 1059 decks -1% synergy
Act of Treason
8% of 3251 decks +7% synergy
Harmonize
8% of 1059 decks -1% synergy
Distant Melody
8% of 804 decks +3% synergy
Bridgeworks Battle
8% of 280 decks +2% synergy
Eaten Alive
8% of 1789 decks +7% synergy
Onward // Victory
8% of 920 decks +8% synergy
Ponder
8% of 804 decks -5% synergy
Utility Artifacts
Swiftfoot Boots
33% of 3250 decks +5% synergy
The Skullspore Nexus
31% of 543 decks +27% synergy
Encroaching Mycosynth
24% of 641 decks +23% synergy
Tarrian's Soulcleaver
24% of 1732 decks +21% synergy
Skullclamp
18% of 3254 decks +6% synergy
Wayfarer's Bauble
18% of 3254 decks +8% synergy
Lightning Greaves
17% of 3254 decks -8% synergy
Ravenous Amulet
16% of 43 decks +7% synergy
The Ozolith
15% of 3207 decks +12% synergy
Ashnod's Altar
15% of 3254 decks +8% synergy
The Reaver Cleaver
14% of 2975 decks +10% synergy
Urabrask's Forge
13% of 2733 decks +11% synergy
Sunforger
12% of 925 decks +8% synergy
Mage Slayer
12% of 1057 decks +10% synergy
Two-Handed Axe
12% of 3054 decks +10% synergy
Door to Nothingness
12% of 366 decks +8% synergy
Animation Module
11% of 3243 decks +11% synergy
Mimic Vat
10% of 3251 decks +9% synergy
Vat of Rebirth
10% of 1505 decks +7% synergy
Oni-Cult Anvil
9% of 1780 decks +7% synergy
Chainsaw
9% of 786 decks +8% synergy
Mask of Griselbrand
9% of 1789 decks +7% synergy
Blackblade Reforged
8% of 3234 decks +4% synergy
Maskwood Nexus
8% of 3193 decks +5% synergy
Cranial Ram
8% of 657 decks +6% synergy
Ichor Wellspring
7% of 3250 decks +6% synergy
Ghost Lantern
7% of 1761 decks +7% synergy
Diamond Pick-Axe
7% of 1678 decks +4% synergy
Phyrexian Processor
7% of 3254 decks +6% synergy
Strionic Resonator
6% of 3248 decks +3% synergy
Ruby Medallion
6% of 3254 decks +3% synergy
Phyrexian Altar
6% of 3254 decks +2% synergy
The Great Henge
6% of 1044 decks -4% synergy
Whispersilk Cloak
6% of 3254 decks +2% synergy
Grafted Wargear
5% of 3254 decks +5% synergy
Enchantments
Valkyrie's Call
34% of 35 decks +30% synergy
Rancor
34% of 1059 decks +29% synergy
Barren Glory
27% of 925 decks +27% synergy
Black Market Connections
26% of 1761 decks +15% synergy
Leyline of Mutation
24% of 17 decks +8% synergy
Leyline of Transformation
23% of 101 decks +20% synergy
Reflections of Littjara
21% of 789 decks +16% synergy
Hatching Plans
21% of 805 decks +21% synergy
Unnatural Growth
18% of 1007 decks +12% synergy
Gift of Immortality
17% of 922 decks +15% synergy
Martyr's Bond
17% of 924 decks +17% synergy
Spelunking
17% of 492 decks +12% synergy
Smothering Tithe
17% of 914 decks -8% synergy
Greater Good
17% of 1059 decks +12% synergy
Garruk's Uprising
16% of 1039 decks +1% synergy
Rhystic Study
15% of 805 decks -12% synergy
Rakdos Joins Up
15% of 762 decks +12% synergy
Revel in Riches
15% of 1821 decks +12% synergy
Goblin Bombardment
15% of 3254 decks +8% synergy
Rhythm of the Wild
15% of 1050 decks -9% synergy
Phyrexian Arena
14% of 1824 decks -1% synergy
Agent of the Iron Throne
13% of 1761 decks +11% synergy
Death's Presence
13% of 1057 decks +12% synergy
Mirari's Wake
13% of 440 decks -0% synergy
Dying Wish
13% of 1824 decks +13% synergy
Into the Pit
12% of 269 decks +8% synergy
Riveteers Ascendancy
12% of 585 decks +7% synergy
Mystic Remora
11% of 805 decks -7% synergy
Sigil of the New Dawn
11% of 925 decks +11% synergy
Etchings of the Chosen
10% of 391 decks +7% synergy
Wild Growth
10% of 1059 decks -1% synergy
Dazzling Theater // Prop Room
10% of 40 decks -7% synergy
Aqueous Form
10% of 803 decks +6% synergy
Descent into Avernus
9% of 3054 decks +6% synergy
Fallen Ideal
9% of 1824 decks +9% synergy
Curse of Opulence
9% of 3238 decks +6% synergy
Gratuitous Violence
9% of 3254 decks +7% synergy
Thickest in the Thicket
8% of 132 decks +5% synergy
Bastion of Remembrance
8% of 1815 decks +2% synergy
City on Fire
8% of 2500 decks +3% synergy
Prismatic Omen
8% of 1057 decks +7% synergy
Fiery Emancipation
8% of 3203 decks +4% synergy
Warstorm Surge
8% of 3250 decks +3% synergy
Utopia Sprawl
8% of 1059 decks +0% synergy
Sylvan Library
8% of 1059 decks -4% synergy
Call to the Kindred
8% of 803 decks +7% synergy
Kaya's Ghostform
8% of 1819 decks +4% synergy
Vampiric Rites
8% of 1823 decks +5% synergy
Sneak Attack
7% of 3254 decks +5% synergy
Necrosynthesis
7% of 1789 decks +7% synergy
Planeswalkers
Minsc & Boo, Timeless Heroes
7% of 956 decks +5% synergy
Chandra, Acolyte of Flame
6% of 3221 decks +6% synergy
Tevesh Szat, Doom of Fools
6% of 1814 decks +5% synergy
Huatli, the Sun's Heart
5% of 437 decks +4% synergy
Liliana, Dreadhorde General
5% of 1819 decks +1% synergy
Utility Lands
Rogue's Passage
35% of 3250 decks +15% synergy
Kessig Wolf Run
27% of 1057 decks +12% synergy
Bojuka Bog
25% of 1824 decks -5% synergy
Slayers' Stronghold
19% of 924 decks +13% synergy
Phyrexian Tower
17% of 1824 decks +9% synergy
Reliquary Tower
15% of 3251 decks -15% synergy
High Market
14% of 3254 decks +11% synergy
Seat of the Synod
13% of 805 decks +6% synergy
Mosswort Bridge
11% of 1057 decks +1% synergy
Sunhome, Fortress of the Legion
11% of 925 decks +5% synergy
Mines of Moria
10% of 2294 decks +6% synergy
Ancient Den
10% of 925 decks +5% synergy
Treasure Vault
10% of 3157 decks +8% synergy
Boseiju, Who Endures
10% of 992 decks -10% synergy
Skarrg, the Rage Pits
10% of 1059 decks +6% synergy
Spinerock Knoll
9% of 3252 decks +5% synergy
Tree of Tales
9% of 1059 decks +7% synergy
Arena of Glory
9% of 983 decks -0% synergy
Spymaster's Vault
8% of 698 decks +4% synergy
Vault of Whispers
8% of 1824 decks +3% synergy
Urborg, Tomb of Yawgmoth
7% of 3254 decks -2% synergy
War Room
7% of 3198 decks +1% synergy
Shizo, Death's Storehouse
7% of 1824 decks +2% synergy
The Black Gate
7% of 1286 decks +3% synergy
Kher Keep
7% of 3254 decks +4% synergy
Temple of the False God
7% of 3254 decks -3% synergy
Three Tree City
6% of 776 decks -3% synergy
Yavimaya, Cradle of Growth
6% of 3173 decks -3% synergy
Mudflat Village
6% of 526 decks +3% synergy
Command Beacon
6% of 3244 decks +1% synergy
Lilypad Village
6% of 241 decks +3% synergy
Ancient Tomb
6% of 3254 decks -5% synergy
Desolate Lighthouse
6% of 803 decks +2% synergy
Secluded Steppe
6% of 925 decks +2% synergy
Great Furnace
5% of 3254 decks -0% synergy
Takenuma, Abandoned Mire
5% of 1780 decks -5% synergy
Forgotten Cave
5% of 3254 decks +1% synergy
Needle Spires
5% of 921 decks +4% synergy
Fountainport
5% of 695 decks +1% synergy
Mana Artifacts
Sol Ring
78% of 3254 decks -6% synergy
Arcane Signet
69% of 3220 decks -4% synergy
Boros Signet
38% of 925 decks +15% synergy
Rakdos Signet
34% of 1824 decks +5% synergy
Chronatog Totem
27% of 805 decks +27% synergy
Izzet Signet
26% of 805 decks -2% synergy
Talisman of Conviction
26% of 913 decks +2% synergy
Talisman of Indulgence
25% of 1824 decks -2% synergy
Mind Stone
24% of 3254 decks +7% synergy
Commander's Sphere
23% of 3246 decks +8% synergy
Talisman of Creativity
20% of 798 decks -9% synergy
Fellwar Stone
19% of 3254 decks -2% synergy
Dimir Signet
19% of 557 decks -11% synergy
Gruul Signet
17% of 1059 decks +5% synergy
Talisman of Dominance
15% of 557 decks -17% synergy
Relic of Sauron
11% of 381 decks +0% synergy
Golgari Signet
11% of 617 decks -1% synergy
Orzhov Signet
10% of 393 decks -16% synergy
Chromatic Lantern
10% of 3250 decks +1% synergy
Patchwork Banner
9% of 717 decks -0% synergy
Marble Diamond
9% of 925 decks +5% synergy
Fire Diamond
9% of 3254 decks +4% synergy
Simic Signet
9% of 478 decks -6% synergy
Thought Vessel
9% of 3244 decks -8% synergy
Selesnya Signet
8% of 440 decks -0% synergy
Talisman of Impulse
8% of 1059 decks -1% synergy
Cursed Mirror
8% of 3184 decks +3% synergy
Timeless Lotus
8% of 320 decks -6% synergy
Glittering Stockpile
7% of 3091 decks +5% synergy
Patriar's Seal
6% of 3054 decks +5% synergy
Azorius Signet
6% of 402 decks -20% synergy
Boros Locket
6% of 914 decks +5% synergy
Talisman of Resilience
5% of 614 decks -7% synergy
Lands
Command Tower
74% of 3250 decks +0% synergy
Smoldering Marsh
45% of 1823 decks +12% synergy
The World Tree
42% of 361 decks +9% synergy
Dragonskull Summit
41% of 1824 decks +10% synergy
Stomping Ground
38% of 1059 decks -3% synergy
Blazemire Verge
36% of 361 decks +16% synergy
Cinder Glade
35% of 1054 decks -4% synergy
Overgrown Tomb
35% of 617 decks -8% synergy
Indatha Triome
34% of 370 decks +3% synergy
Evolving Wilds
33% of 3251 decks +12% synergy
Blood Crypt
33% of 1824 decks -6% synergy
Frontier Bivouac
32% of 477 decks +5% synergy
Ketria Triome
32% of 474 decks -0% synergy
Jetmir's Garden
31% of 410 decks -1% synergy
Breeding Pool
31% of 478 decks -10% synergy
Ziatora's Proving Ground
31% of 585 decks -1% synergy
Zagoth Triome
30% of 364 decks -0% synergy
Savage Lands
30% of 617 decks +7% synergy
Spara's Headquarters
29% of 347 decks -3% synergy
Seething Landscape
29% of 203 decks +14% synergy
Clifftop Retreat
28% of 924 decks -1% synergy
Exotic Orchard
28% of 3251 decks -7% synergy
Godless Shrine
28% of 393 decks -13% synergy
Temple of Triumph
28% of 922 decks +11% synergy
Terramorphic Expanse
28% of 3254 decks +12% synergy
Crumbling Necropolis
27% of 557 decks -4% synergy
Rootbound Crag
27% of 1057 decks +3% synergy
Steam Vents
27% of 805 decks -12% synergy
Battlefield Forge
27% of 925 decks +2% synergy
Luxury Suite
26% of 1821 decks -0% synergy
Sacred Foundry
26% of 925 decks -10% synergy
Myriad Landscape
26% of 3246 decks +6% synergy
Jungle Shrine
26% of 440 decks -6% synergy
Boros Garrison
25% of 925 decks +10% synergy
Temple Garden
25% of 440 decks -15% synergy
Sulfur Falls
25% of 803 decks -6% synergy
Sulfurous Springs
25% of 1824 decks +4% synergy
Rakdos Carnarium
24% of 1824 decks +9% synergy
Foreboding Ruins
23% of 1823 decks +7% synergy
Rockfall Vale
23% of 1007 decks +1% synergy
Shivan Reef
23% of 805 decks -4% synergy
Haunted Ridge
22% of 1789 decks +6% synergy
Watery Grave
21% of 557 decks -20% synergy
Furycalm Snarl
21% of 897 decks +7% synergy
Spire Garden
20% of 1050 decks -4% synergy
Karplusan Forest
20% of 1059 decks +3% synergy
Hallowed Fountain
20% of 402 decks -20% synergy
Tainted Peak
20% of 1824 decks +10% synergy
Thornspire Verge
19% of 113 decks +2% synergy
Raugrin Triome
19% of 397 decks -7% synergy