Felisa, Fang of Silverquill + Nim Deathmantle + Ashnod's Altar + Spiteful Squad

Felisa, Fang of Silverquill
Nim Deathmantle
Ashnod's Altar
Spiteful Squad

Requires
Felisa, Fang of Silverquill must be on the battlefield. Nim Deathmantle must be on the battlefield. Ashnod's Altar must be on the battlefield. Spiteful Squad must be on the battlefield. Spiteful Squad has at least one +1/+1 counter on it.
Steps
  1. Activate Ashnod's Altar by sacrificing Spiteful Squad, adding .
  2. Spiteful Squad dies, triggering itself, Felisa and Nim Deathmantle.
  3. Resolve the Spiteful Squad trigger, moving its +1/+1 counters onto another creature you control.
  4. Resolve the Felisa trigger, creating a 2/1 Inkling creature token for each counter that was on Spiteful Squad.
  5. Activate Ashnod's Altar by sacrificing an Inkling, adding .
  6. Resolve the Nim Deathmantle trigger from step 2, causing you to pay 4 to return Spiteful Squad from your graveyard to the battlefield, and attach Nim Deathmantle to it.
  7. Repeat.
Results
Infinite +1/+1 counters. Infinite colorless mana. Infinite creature tokens. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

Felisa, Fang of Silverquill
0.12% of 1618 decks 2 decks
Creatures
Shelob, Dread Weaver
100% of 1 decks +100% synergy
Razorlash Transmogrant
100% of 1 decks +100% synergy
Rosie Cotton of South Lane
100% of 1 decks +98% synergy
Carrion Feeder
100% of 2 decks +88% synergy
Zulaport Cutthroat
100% of 2 decks +71% synergy
Blood Artist
100% of 2 decks +65% synergy
Glint Hawk
50% of 2 decks +50% synergy
Myriad Construct
50% of 2 decks +50% synergy
Boonweaver Giant
50% of 2 decks +50% synergy
Herald of Anguish
50% of 2 decks +50% synergy
Skyclave Shade
50% of 2 decks +50% synergy
Kalastria Highborn
50% of 2 decks +50% synergy
Prowling Geistcatcher
50% of 2 decks +50% synergy
Flesh Carver
50% of 2 decks +50% synergy
Ornithopter
50% of 2 decks +50% synergy
Serra Redeemer
50% of 2 decks +50% synergy
Custodi Soulbinders
50% of 2 decks +50% synergy
Bloodgift Demon
50% of 2 decks +49% synergy
Stonecoil Serpent
50% of 2 decks +49% synergy
Skyclave Shadowcat
50% of 2 decks +49% synergy
Nikara, Lair Scavenger
50% of 2 decks +49% synergy
Boss's Chauffeur
50% of 2 decks +49% synergy
Knight of the Ebon Legion
50% of 2 decks +49% synergy
Grave Titan
50% of 2 decks +49% synergy
Shriekmaw
50% of 2 decks +49% synergy
Hopeful Initiate
50% of 2 decks +48% synergy
Merciless Executioner
50% of 2 decks +48% synergy
God-Eternal Bontu
50% of 2 decks +48% synergy
K'rrik, Son of Yawgmoth
50% of 2 decks +48% synergy
Ravenous Chupacabra
50% of 2 decks +48% synergy
Lion Sash
50% of 2 decks +48% synergy
Ogre Slumlord
50% of 2 decks +47% synergy
Endrek Sahr, Master Breeder
50% of 2 decks +47% synergy
Teshar, Ancestor's Apostle
50% of 2 decks +47% synergy
Shaile, Dean of Radiance
50% of 2 decks +47% synergy
Bloodtracker
50% of 2 decks +47% synergy
Fleshbag Marauder
50% of 2 decks +47% synergy
Erebos, Bleak-Hearted
50% of 2 decks +47% synergy
Leonin Relic-Warder
50% of 2 decks +46% synergy
Harvester of Souls
50% of 2 decks +46% synergy
Sifter of Skulls
50% of 2 decks +46% synergy
Lae'zel, Vlaakith's Champion
50% of 2 decks +45% synergy
Mikaeus, the Lunarch
50% of 2 decks +45% synergy
Hallowed Spiritkeeper
50% of 2 decks +45% synergy
Plaguecrafter
50% of 2 decks +45% synergy
Sunscorch Regent
50% of 2 decks +45% synergy
Weathered Wayfarer
50% of 2 decks +44% synergy
Ophiomancer
50% of 2 decks +43% synergy
Ayli, Eternal Pilgrim
50% of 2 decks +42% synergy
Midnight Reaper
50% of 2 decks +41% synergy
Instants
Anguished Unmaking
100% of 2 decks +61% synergy
Malakir Rebirth
50% of 2 decks +38% synergy
Enlightened Tutor
50% of 2 decks +36% synergy
Inkshield
50% of 2 decks +36% synergy
Teferi's Protection
50% of 2 decks +31% synergy
Generous Gift
50% of 2 decks +21% synergy
Sorceries
Profane Command
50% of 2 decks +50% synergy
Black Sun's Zenith
50% of 2 decks +49% synergy
Blot Out the Sky
50% of 2 decks +46% synergy
Agadeem's Awakening
50% of 2 decks +44% synergy
Sevinne's Reclamation
50% of 2 decks +40% synergy
Rite of Oblivion
50% of 2 decks +38% synergy
Vindicate
50% of 2 decks +35% synergy
Night's Whisper
50% of 2 decks +34% synergy
Victimize
50% of 2 decks +30% synergy
Damn
50% of 2 decks +15% synergy
Utility Artifacts
Agatha's Soul Cauldron
100% of 1 decks +99% synergy
Vat of Rebirth
100% of 1 decks +95% synergy
Norn's Wellspring
100% of 1 decks +94% synergy
Altar of Dementia
100% of 2 decks +94% synergy
Skullclamp
100% of 2 decks +68% synergy
Blasting Station
50% of 2 decks +48% synergy
Weatherlight Compleated
50% of 2 decks +48% synergy
Whip of Erebos
50% of 2 decks +47% synergy
Sword of the Animist
50% of 2 decks +46% synergy
The Ozolith
50% of 2 decks +46% synergy
Blade of the Bloodchief
50% of 2 decks +44% synergy
Lightning Greaves
50% of 2 decks +28% synergy
Swiftfoot Boots
50% of 2 decks +24% synergy
Enchantments
Darkest Hour
50% of 2 decks +49% synergy
Resourceful Defense
50% of 2 decks +48% synergy
Open the Graves
50% of 2 decks +48% synergy
Together Forever
50% of 2 decks +47% synergy
Dark Prophecy
50% of 2 decks +45% synergy
Minion's Return
50% of 2 decks +45% synergy
Cathars' Crusade
50% of 2 decks +45% synergy
Dictate of Erebos
50% of 2 decks +40% synergy
Sanguine Bond
50% of 2 decks +28% synergy
Phyrexian Arena
50% of 2 decks +24% synergy
Planeswalkers
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50% of 2 decks +50% synergy
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50% of 2 decks +50% synergy
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50% of 2 decks +50% synergy
Utility Lands
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50% of 2 decks +49% synergy
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50% of 2 decks +49% synergy
Barren Moor
50% of 2 decks +45% synergy
Karn's Bastion
50% of 2 decks +44% synergy
Eiganjo, Seat of the Empire
50% of 2 decks +38% synergy
Takenuma, Abandoned Mire
50% of 2 decks +36% synergy
High Market
50% of 2 decks +35% synergy
Mana Artifacts
Thought Vessel
100% of 2 decks +88% synergy
Talisman of Hierarchy
100% of 2 decks +44% synergy
Arcane Signet
100% of 2 decks +18% synergy
Sol Ring
100% of 2 decks +13% synergy
Prismatic Lens
50% of 2 decks +49% synergy
Marble Diamond
50% of 2 decks +42% synergy
Fellwar Stone
50% of 2 decks +28% synergy
Mind Stone
50% of 2 decks +20% synergy
Orzhov Signet
50% of 2 decks -14% synergy
Lands
Marsh Flats
100% of 2 decks +70% synergy
Godless Shrine
100% of 2 decks +51% synergy
Hall of Oracles
50% of 2 decks +50% synergy
Study Hall
50% of 2 decks +49% synergy
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50% of 2 decks +47% synergy
Mana Confluence
50% of 2 decks +46% synergy
Opal Palace
50% of 2 decks +46% synergy
City of Brass
50% of 2 decks +46% synergy
Flooded Strand
50% of 2 decks +45% synergy
Polluted Delta
50% of 2 decks +45% synergy
Windswept Heath
50% of 2 decks +45% synergy
Bloodstained Mire
50% of 2 decks +45% synergy
Verdant Catacombs
50% of 2 decks +44% synergy
Prismatic Vista
50% of 2 decks +43% synergy
Fabled Passage
50% of 2 decks +41% synergy
Scrubland
50% of 2 decks +39% synergy
Snowfield Sinkhole
50% of 2 decks +38% synergy
Sunlit Marsh
50% of 2 decks +36% synergy
Silent Clearing
50% of 2 decks +34% synergy
Concealed Courtyard
50% of 2 decks +31% synergy
Scoured Barrens
50% of 2 decks +27% synergy
Exotic Orchard
50% of 2 decks +26% synergy
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50% of 2 decks +18% synergy
Fetid Heath
50% of 2 decks +15% synergy
Vault of Champions
50% of 2 decks +8% synergy
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50% of 2 decks +7% synergy
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50% of 2 decks -9% synergy
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Command Tower
50% of 2 decks -37% synergy