Nim Deathmantle + Ashnod's Altar + Chittering Witch

Nim Deathmantle
Ashnod's Altar
Chittering Witch

Requires
Nim Deathmantle must be on the battlefield. Ashnod's Altar must be on the battlefield. Chittering Witch must be on the battlefield. You have at least two opponents. Mana needed: 2
Steps
  1. Activate Ashnod's Altar by sacrificing Chittering Witch, adding .
  2. Chittering Witch dies, triggering Nim Deathmantle, causing you to pay 4 to return Chittering Witch from your graveyard to the battlefield, and attach Nim Deathmantle to it.
  3. Chittering Witch enters the battlefield, creating at least two 1/1 Rat creature tokens.
  4. Activate Ashnod's Altar by sacrificing a Rat, adding .
  5. Repeat.
Results
Infinite colorless mana. Infinite creature tokens. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

Ayara, First of Locthwain
2.94% of 4836 decks 142 decks
Wick, the Whorled Mind
1.00% of 5285 decks 53 decks
Totentanz, Swarm Piper
1.27% of 2830 decks 36 decks
Marrow-Gnawer
0.21% of 9092 decks 19 decks
Teysa, Orzhov Scion
0.66% of 2744 decks 18 decks
Torgaar, Famine Incarnate
4.26% of 399 decks 17 decks
Karumonix, the Rat King
0.20% of 6037 decks 12 decks
Alesha, Who Smiles at Death
0.19% of 5907 decks 11 decks
Elenda, the Dusk Rose
0.19% of 5369 decks 10 decks
Kels, Fight Fixer
1.18% of 678 decks 8 decks
Ashcoat of the Shadow Swarm
0.22% of 3150 decks 7 decks
Yawgmoth, Thran Physician
0.12% of 5603 decks 7 decks
Garna, Bloodfist of Keld
0.35% of 1724 decks 6 decks
Syr Konrad, the Grim
0.13% of 4644 decks 6 decks
Lord Skitter, Sewer King
0.82% of 613 decks 5 decks
Savra, Queen of the Golgari
0.17% of 2897 decks 5 decks
The Meep
1.01% of 493 decks 5 decks
Korvold, Fae-Cursed King
0.03% of 15536 decks 4 decks
New Cards
Leyline of Transformation
76% of 21 decks +73% synergy
Revenge of the Rats
62% of 8 decks +58% synergy
Withering Torment
50% of 40 decks +30% synergy
Blasphemous Edict
43% of 14 decks +9% synergy
Nashi, Searcher in the Dark
40% of 10 decks +37% synergy
High Synergy Cards
Vren, the Relentless
69% of 54 decks +66% synergy
Song of Totentanz
68% of 111 decks +66% synergy
Skullclamp
72% of 500 decks +60% synergy
Azure Beastbinder
62% of 39 decks +59% synergy
Redcap Gutter-Dweller
58% of 113 decks +58% synergy
Goblin Bombardment
60% of 146 decks +53% synergy
Zulaport Cutthroat
61% of 500 decks +51% synergy
Cruel Celebrant
59% of 63 decks +50% synergy
Pitiless Plunderer
57% of 500 decks +49% synergy
Ogre Chitterlord
50% of 111 decks +49% synergy
Top Cards
Counterspell
60% of 85 decks +17% synergy
Elas il-Kor, Sadistic Pilgrim
59% of 59 decks +48% synergy
Swords to Plowshares
57% of 63 decks -6% synergy
Blood Artist
54% of 500 decks +43% synergy
Dark Ritual
54% of 500 decks +32% synergy
Impact Tremors
53% of 146 decks +44% synergy
Lord Skitter, Sewer King
50% of 313 decks +48% synergy
Phyrexian Altar
50% of 500 decks +46% synergy
Anguished Unmaking
49% of 63 decks +25% synergy
Shoreline Looter
48% of 56 decks +46% synergy
Creatures
Viscera Seer
48% of 500 decks +38% synergy
Karmic Guide
46% of 63 decks +41% synergy
Witch Enchanter
45% of 20 decks +35% synergy
Totentanz, Swarm Piper
44% of 113 decks +43% synergy
Gray Merchant of Asphodel
44% of 500 decks +35% synergy
Teysa Karlov
43% of 63 decks +38% synergy
Eternal Witness
43% of 35 decks +22% synergy
Welcoming Vampire
43% of 61 decks +37% synergy
Warren Soultrader
41% of 189 decks +34% synergy
Mirkwood Bats
41% of 366 decks +29% synergy
Birds of Paradise
40% of 35 decks +13% synergy
Ophiomancer
39% of 500 decks +36% synergy
Ogre Slumlord
39% of 500 decks +37% synergy
Reveillark
38% of 63 decks +36% synergy
Elenda, the Dusk Rose
38% of 63 decks +32% synergy
Chatterfang, Squirrel General
37% of 35 decks +32% synergy
Endrek Sahr, Master Breeder
36% of 500 decks +35% synergy
Braids, Arisen Nightmare
36% of 467 decks +28% synergy
Reassembling Skeleton
36% of 500 decks +32% synergy
Lord Skitter's Butcher
35% of 326 decks +34% synergy
Mindwhisker
35% of 43 decks +34% synergy
Sengir Autocrat
35% of 500 decks +34% synergy
Carrion Feeder
34% of 500 decks +29% synergy
Mad Ratter
34% of 146 decks +34% synergy
Ayara, First of Locthwain
34% of 500 decks +30% synergy
Crypt Ghast
34% of 500 decks +29% synergy
Jadar, Ghoulcaller of Nephalia
34% of 490 decks +31% synergy
Six
33% of 9 decks +26% synergy
Voracious Vermin
33% of 305 decks +32% synergy
Abhorrent Overlord
33% of 500 decks +32% synergy
Sakura-Tribe Elder
31% of 35 decks +13% synergy
Charismatic Conqueror
31% of 32 decks +26% synergy
Bartolomé del Presidio
31% of 32 decks +24% synergy
Persistent Marshstalker
31% of 120 decks +29% synergy
Yawgmoth, Thran Physician
29% of 500 decks +26% synergy
Morbid Opportunist
29% of 490 decks +23% synergy
Avenger of Zendikar
29% of 35 decks +19% synergy
Twisted Sewer-Witch
28% of 313 decks +28% synergy
Mondrak, Glory Dominus
27% of 48 decks +18% synergy
Piper of the Swarm
27% of 500 decks +26% synergy
Corpse Knight
27% of 63 decks +21% synergy
Sun Titan
27% of 63 decks +17% synergy
Harried Spearguard
26% of 111 decks +26% synergy
Mayhem Devil
26% of 146 decks +16% synergy
Llanowar Elves
26% of 35 decks +5% synergy
Gravecrawler
25% of 500 decks +23% synergy
Mentor of the Meek
25% of 63 decks +19% synergy
Syr Konrad, the Grim
25% of 500 decks +16% synergy
Tangled Colony
25% of 313 decks +24% synergy
Nether Traitor
25% of 500 decks +24% synergy
Instants
Sultai Charm
75% of 4 decks +70% synergy
Beast Within
46% of 35 decks +7% synergy
Chaos Warp
39% of 146 decks +7% synergy
Gnawing Crescendo
39% of 106 decks +38% synergy
Path to Exile
38% of 63 decks -8% synergy
Despark
37% of 63 decks +21% synergy
Assassin's Trophy
34% of 35 decks +4% synergy
Arcane Denial
33% of 85 decks +13% synergy
Village Rites
32% of 495 decks +22% synergy
Negate
31% of 85 decks +8% synergy
Untimely Malfunction
30% of 20 decks +14% synergy
An Offer You Can't Refuse
29% of 83 decks +8% synergy
Deadly Dispute
29% of 490 decks +18% synergy
Vampiric Tutor
28% of 500 decks +10% synergy
Malakir Rebirth
28% of 495 decks +20% synergy
Terminate
26% of 146 decks +5% synergy
Worldly Tutor
26% of 35 decks +12% synergy
Boros Charm
25% of 16 decks -0% synergy
Fierce Guardianship
25% of 85 decks +7% synergy
Cyclonic Rift
25% of 85 decks -3% synergy
Bedevil
24% of 146 decks +10% synergy
Fell the Profane
23% of 189 decks +11% synergy
Teferi's Protection
22% of 63 decks +2% synergy
Legolas's Quick Reflexes
21% of 14 decks +18% synergy
Deadly Rollick
21% of 495 decks +11% synergy
Tragic Slip
21% of 500 decks +18% synergy
Culling the Weak
21% of 500 decks +17% synergy
Mana Drain
21% of 85 decks +6% synergy
Enlightened Tutor
21% of 63 decks +3% synergy
Chord of Calling
20% of 35 decks +14% synergy
Putrefy
20% of 35 decks +4% synergy
Corrupted Conviction
19% of 380 decks +14% synergy
Afterlife Insurance
19% of 21 decks +18% synergy
Defile
18% of 500 decks +15% synergy
Abrupt Decay
17% of 35 decks +7% synergy
Plumb the Forbidden
16% of 491 decks +13% synergy
Swan Song
16% of 85 decks -0% synergy
Generous Gift
16% of 63 decks -10% synergy
Abrade
16% of 146 decks +4% synergy
Deflecting Swat
15% of 146 decks -1% synergy
Utter End
14% of 63 decks +7% synergy
Krosan Grip
14% of 35 decks +7% synergy
Crop Rotation
14% of 35 decks +4% synergy
Szat's Will
14% of 495 decks +13% synergy
Pongify
14% of 85 decks +3% synergy
Brainstorm
14% of 85 decks -7% synergy
Infernal Grasp
13% of 490 decks +6% synergy
Stroke of Midnight
13% of 38 decks +1% synergy
Rakdos Charm
13% of 146 decks -1% synergy
Sink into Stupor
13% of 63 decks -0% synergy
Sorceries
Feed the Swarm
43% of 495 decks +24% synergy
Blasphemous Act
42% of 146 decks +8% synergy
Diabolic Intent
39% of 500 decks +30% synergy
Plague of Vermin
37% of 500 decks +37% synergy
Victimize
36% of 500 decks +24% synergy
Demonic Tutor
35% of 500 decks +13% synergy
Rampant Growth
31% of 35 decks -3% synergy
Thrilling Discovery
31% of 16 decks +29% synergy
Toxic Deluge
30% of 500 decks +13% synergy
Reanimate
30% of 500 decks +14% synergy
Damn
29% of 62 decks +13% synergy
Three Visits
29% of 35 decks +4% synergy
Nature's Lore
29% of 35 decks -3% synergy
Cultivate
29% of 35 decks -18% synergy
Swarmyard Massacre
27% of 81 decks +23% synergy
Culling Ritual
26% of 35 decks +15% synergy
Farseek
26% of 35 decks -8% synergy
Ruinous Ultimatum
25% of 16 decks +7% synergy
Vandalblast
21% of 146 decks +4% synergy
Finale of Devastation
20% of 35 decks +12% synergy
Sevinne's Reclamation
19% of 63 decks +12% synergy
Agadeem's Awakening
18% of 495 decks +15% synergy
Rise of the Witch-king
18% of 22 decks +12% synergy
Dusk // Dawn
17% of 63 decks +14% synergy
Faithless Looting
16% of 146 decks -0% synergy
Sign in Blood
16% of 500 decks +7% synergy
Damnation
16% of 500 decks +8% synergy
Dread Return
15% of 500 decks +10% synergy
Jeska's Will
15% of 146 decks -2% synergy
Army of the Damned
15% of 500 decks +12% synergy
Pest Infestation
14% of 35 decks +12% synergy
Bala Ged Recovery
14% of 35 decks +5% synergy
Kodama's Reach
14% of 35 decks -17% synergy
Rite of Replication
14% of 85 decks +11% synergy
Distant Melody
14% of 85 decks +9% synergy
Grim Tutor
14% of 500 decks +9% synergy
Beseech the Mirror
13% of 326 decks +9% synergy
Living Death
13% of 500 decks +7% synergy
Night's Whisper
12% of 500 decks +3% synergy
Diabolic Tutor
12% of 500 decks +5% synergy
Eldritch Evolution
11% of 35 decks +7% synergy
Explore
11% of 35 decks +2% synergy
Shamanic Revelation
11% of 35 decks +2% synergy
Insatiable Avarice
11% of 211 decks +7% synergy
Exsanguinate
11% of 500 decks +6% synergy
Vindicate
11% of 63 decks +4% synergy
Austere Command
11% of 63 decks -2% synergy
Season of Weaving
11% of 56 decks +7% synergy
Read the Bones
11% of 500 decks +3% synergy
Mutilate
10% of 500 decks +8% synergy
Utility Artifacts
Jet Medallion
31% of 500 decks +28% synergy
Bolas's Citadel
31% of 500 decks +22% synergy
Bontu's Monument
27% of 500 decks +25% synergy
Lightning Greaves
23% of 500 decks -3% synergy
Banner of Kinship
21% of 14 decks +9% synergy
Thornbite Staff
16% of 500 decks +15% synergy
Wayfarer's Bauble
15% of 500 decks +5% synergy
Swiftfoot Boots
15% of 500 decks -13% synergy
Altar of Dementia
15% of 500 decks +12% synergy
Birthing Pod
14% of 35 decks +12% synergy
Bootleggers' Stash
12% of 34 decks +9% synergy
Expedition Map
10% of 500 decks +7% synergy
Wishclaw Talisman
9% of 500 decks +4% synergy
The One Ring
9% of 383 decks -0% synergy
Panharmonicon
9% of 500 decks +5% synergy
Vat of Rebirth
8% of 396 decks +5% synergy
Sensei's Divining Top
6% of 500 decks +1% synergy
Staff of the Storyteller
6% of 48 decks +5% synergy
Whip of Erebos
6% of 500 decks +3% synergy
Spawning Pit
6% of 500 decks +6% synergy
Maskwood Nexus
6% of 491 decks +3% synergy
Aetherflux Reservoir
6% of 500 decks +2% synergy
Enchantments
Bastion of Remembrance
37% of 495 decks +31% synergy
Smothering Tithe
37% of 63 decks +12% synergy
Arcane Adaptation
36% of 85 decks +35% synergy
Bitterblossom
33% of 500 decks +29% synergy
Kindred Discovery
31% of 85 decks +23% synergy
Moldervine Reclamation
29% of 35 decks +20% synergy
Rhystic Study
26% of 85 decks -2% synergy
Parallel Lives
26% of 35 decks +18% synergy
The Meathook Massacre
25% of 490 decks +20% synergy
Mystic Remora
25% of 85 decks +7% synergy
Shared Animosity
25% of 146 decks +20% synergy
Grave Pact
25% of 500 decks +20% synergy
Dreadhorde Invasion
21% of 500 decks +18% synergy
Black Market Connections
21% of 474 decks +10% synergy
Phyrexian Arena
19% of 500 decks +4% synergy
Chthonian Nightmare
19% of 194 decks +16% synergy
Animate Dead
19% of 500 decks +10% synergy
Intruder Alarm
19% of 85 decks +17% synergy
Black Market
19% of 500 decks +14% synergy
Virtue of Knowledge
18% of 72 decks +15% synergy
Phyrexian Reclamation
18% of 500 decks +14% synergy
Anointed Procession
17% of 63 decks +9% synergy
Necropotence
17% of 500 decks +12% synergy
Into the Pit
17% of 23 decks +12% synergy
Cryptolith Rite
17% of 35 decks +14% synergy
Dictate of Erebos
17% of 500 decks +13% synergy
Cathars' Crusade
16% of 63 decks +10% synergy
Land Tax
16% of 63 decks +9% synergy
Elven Chorus
15% of 20 decks +10% synergy
Pattern of Rebirth
14% of 35 decks +14% synergy
Gift of Immortality
14% of 63 decks +12% synergy
Wild Growth
14% of 35 decks +3% synergy
Skrelv's Hive
14% of 50 decks +11% synergy
Echoing Assault
14% of 29 decks +8% synergy
Dark Prophecy
13% of 500 decks +12% synergy
Carnival of Souls
12% of 500 decks +12% synergy
Reflections of Littjara
12% of 84 decks +7% synergy
Earthcraft
11% of 35 decks +11% synergy
Squirrel Nest
11% of 35 decks +10% synergy
Awakening Zone
11% of 35 decks +9% synergy
Growing Rites of Itlimoc
11% of 35 decks +6% synergy
Doubling Season
11% of 35 decks +2% synergy
Reconnaissance
11% of 63 decks +9% synergy
Raid Bombardment
11% of 146 decks +10% synergy
Exquisite Blood
9% of 500 decks +4% synergy
One with the Kami
9% of 34 decks +8% synergy
Sanguine Bond
9% of 500 decks +3% synergy
Evolutionary Leap
9% of 35 decks +7% synergy
Survival of the Fittest
9% of 35 decks +7% synergy
Sylvan Library
9% of 35 decks -3% synergy
Planeswalkers
Liliana, Dreadhorde General
22% of 500 decks +19% synergy
Elspeth, Sun's Champion
22% of 63 decks +18% synergy
Tevesh Szat, Doom of Fools
16% of 495 decks +15% synergy
Grist, the Hunger Tide
14% of 35 decks +11% synergy
Vraska, Golgari Queen
11% of 35 decks +9% synergy
Lolth, Spider Queen
10% of 490 decks +9% synergy
Garruk, Cursed Huntsman
9% of 35 decks +6% synergy
Tezzeret, Master of the Bridge
6% of 85 decks +3% synergy
Utility Lands
Bojuka Bog
47% of 500 decks +17% synergy
Cabal Coffers
44% of 500 decks +33% synergy
Urborg, Tomb of Yawgmoth
39% of 500 decks +29% synergy
Phyrexian Tower
37% of 500 decks +28% synergy
Shifting Woodland
33% of 9 decks +24% synergy
Boseiju, Who Endures
32% of 34 decks +13% synergy
Witch's Cottage
29% of 500 decks +25% synergy
Three Tree City
27% of 125 decks +17% synergy
Nykthos, Shrine to Nyx
27% of 500 decks +21% synergy
Reliquary Tower
25% of 500 decks -4% synergy
Mudflat Village
25% of 127 decks +22% synergy
Vault of the Archangel
24% of 63 decks +13% synergy
Cabal Stronghold
23% of 500 decks +19% synergy
Castle Locthwain
21% of 500 decks +15% synergy
High Market
20% of 500 decks +17% synergy
Spymaster's Vault
20% of 189 decks +16% synergy
Takenuma, Abandoned Mire
19% of 482 decks +9% synergy
Swarmyard
16% of 500 decks +15% synergy
Lilypad Village
16% of 57 decks +13% synergy
Otawara, Soaring City
15% of 84 decks -1% synergy
Restless Cottage
15% of 20 decks +10% synergy
Grim Backwoods
14% of 35 decks +10% synergy
Mortuary Mire
14% of 500 decks +9% synergy
Westvale Abbey
13% of 500 decks +11% synergy
Gaea's Cradle
11% of 35 decks +6% synergy
Ancient Tomb
10% of 500 decks -0% synergy
Rogue's Passage
10% of 500 decks -10% synergy
Castle Ardenvale
10% of 63 decks +4% synergy
Minas Tirith
10% of 42 decks +0% synergy
Crypt of Agadeem
9% of 500 decks +7% synergy
Eiganjo, Seat of the Empire
8% of 61 decks -1% synergy
Shambling Vent
8% of 63 decks +6% synergy
War Room
8% of 495 decks +1% synergy
Sokenzan, Crucible of Defiance
8% of 144 decks +3% synergy
Fountainport
8% of 92 decks +4% synergy
Great Furnace
8% of 146 decks +2% synergy
Volrath's Stronghold
7% of 500 decks +6% synergy
Windbrisk Heights
6% of 63 decks +2% synergy
Shizo, Death's Storehouse
6% of 500 decks +1% synergy
Castle Embereth
6% of 146 decks +2% synergy
Creeping Tar Pit
6% of 85 decks +3% synergy
Seat of the Synod
6% of 85 decks -0% synergy
Barad-dûr
5% of 366 decks +3% synergy
Thespian's Stage
5% of 500 decks +3% synergy
Temple of the False God
5% of 500 decks -4% synergy
Barren Moor
5% of 500 decks +1% synergy
Buried Ruin
5% of 500 decks +0% synergy
Mana Artifacts
Sol Ring
91% of 500 decks +7% synergy
Arcane Signet
75% of 500 decks +3% synergy
Orzhov Signet
67% of 63 decks +40% synergy
Talisman of Hierarchy
65% of 63 decks +41% synergy
Talisman of Dominance
58% of 85 decks +26% synergy
Talisman of Indulgence
54% of 146 decks +28% synergy
Talisman of Conviction
50% of 16 decks +27% synergy
Boros Signet
50% of 16 decks +27% synergy
Dimir Signet
46% of 85 decks +16% synergy
Rakdos Signet
45% of 146 decks +16% synergy
Talisman of Creativity
39% of 62 decks +10% synergy
Fellwar Stone
24% of 500 decks +3% synergy
Talisman of Resilience
20% of 35 decks +8% synergy
Mind Stone
20% of 500 decks +2% synergy
Izzet Signet
18% of 62 decks -11% synergy
Relic of Sauron
16% of 57 decks +5% synergy
Thought Vessel
16% of 500 decks -1% synergy
Charcoal Diamond
13% of 500 decks +8% synergy
Nyx Lotus
13% of 497 decks +11% synergy
Patchwork Banner
12% of 95 decks +2% synergy
Golgari Signet
11% of 35 decks -1% synergy
Crowded Crypt
10% of 490 decks +8% synergy
Mana Crypt
9% of 500 decks +1% synergy
Jeweled Lotus
8% of 495 decks +3% synergy
Mana Vault
8% of 500 decks +2% synergy
Commander's Sphere
8% of 500 decks -7% synergy
Chrome Mox
8% of 500 decks +1% synergy
Caged Sun
6% of 500 decks +4% synergy
Mox Diamond
6% of 500 decks +1% synergy
Throne of Eldraine
5% of 297 decks +3% synergy
Lands
Stomping Ground
86% of 7 decks +45% synergy
Tangled Islet
75% of 4 decks +68% synergy
Opulent Palace
75% of 4 decks +48% synergy
Overgrown Tomb
71% of 35 decks +29% synergy
Sacred Foundry
69% of 16 decks +33% synergy
Caves of Koilos
62% of 63 decks +34% synergy
Godless Shrine
60% of 63 decks +20% synergy
Llanowar Wastes
60% of 35 decks +34% synergy
Watery Grave
53% of 85 decks +12% synergy
Dragonskull Summit
52% of 146 decks +21% synergy
Woodland Cemetery
51% of 35 decks +24% synergy
Blood Crypt
51% of 146 decks +12% synergy
Isolated Chapel
49% of 63 decks +22% synergy
Smoldering Marsh
48% of 146 decks +15% synergy
Steam Vents
47% of 62 decks +8% synergy
Xander's Lounge
47% of 60 decks +19% synergy
Undergrowth Stadium
46% of 35 decks +20% synergy
Underground Mortuary
45% of 11 decks +29% synergy
Command Tower
44% of 500 decks -30% synergy
Vault of Champions
44% of 62 decks +18% synergy
Drowned Catacomb
44% of 85 decks +18% synergy
Ziatora's Proving Ground
43% of 7 decks +11% synergy
Cinder Glade
43% of 7 decks +4% synergy
Crumbling Necropolis
42% of 62 decks +11% synergy
Temple of Silence
41% of 63 decks +23% synergy
Tainted Field
40% of 63 decks +26% synergy
Sunken Hollow
39% of 85 decks +4% synergy
Fetid Heath
38% of 63 decks +27% synergy
Luxury Suite
38% of 146 decks +11% synergy
Savai Triome
38% of 16 decks +10% synergy
Sulfurous Springs
35% of 146 decks +15% synergy
Blazemire Verge
34% of 29 decks +14% synergy
Tainted Wood
34% of 35 decks +21% synergy
Sulfur Falls
34% of 62 decks +3% synergy
Shineshadow Snarl
32% of 62 decks +20% synergy
Morphic Pool
32% of 85 decks +6% synergy
Temple of Malady
31% of 35 decks +15% synergy
Shivan Reef
31% of 62 decks +4% synergy
Training Center
31% of 62 decks +3% synergy
Deathcap Glade
29% of 34 decks +16% synergy
Underground River
29% of 85 decks +10% synergy
Bayou
29% of 35 decks +15% synergy
Golgari Rot Farm
29% of 35 decks +11% synergy
Tainted Peak
28% of 146 decks +18% synergy
Shadowy Backstreet
28% of 25 decks +15% synergy
Brightclimb Pathway
27% of 62 decks +17% synergy
Foreboding Ruins
27% of 146 decks +12% synergy
Shipwreck Marsh
26% of 84 decks +7% synergy
Seething Landscape
26% of 54 decks +11% synergy
Orzhov Basilica
25% of 63 decks +10% synergy