Mairsil, the Pretender + Endling + Cauldron of Souls + Blood Pet + Thousand-Year Elixir

Mairsil, the Pretender
Endling
Cauldron of Souls
Blood Pet
Thousand-Year Elixir

Requires
Mairsil, the Pretender must be on the battlefield. Endling must be in exile. Cauldron of Souls must be in exile. Blood Pet must be in exile. Thousand-Year Elixir must be on the battlefield.
Steps
  1. Activate Mairsil using Cauldron of Souls' ability by tapping it, giving itself persist until end of turn.
  2. Activate Mairsil using Blood Pet's ability by sacrificing it, adding .
  3. When Mairsil dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  4. Activate Mairsil using Endling's third ability by paying , giving Mairsil undying until end of turn.
  5. Activate Mairsil using Blood Pet's ability by sacrificing it, adding .
  6. When Mairsil dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  7. Repeat.
Results
Infinite black mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

Mairsil, the Pretender
0.39% of 1520 decks 6 decks
Top Cards
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100% of 6 decks +99% synergy
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Creatures
Ulamog's Dreadsire
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67% of 6 decks +66% synergy
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Crystalline Crawler
50% of 6 decks +50% synergy
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50% of 6 decks +50% synergy
Triskelion
50% of 6 decks +50% synergy
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50% of 6 decks +50% synergy
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50% of 6 decks +49% synergy
Arco-Flagellant
40% of 5 decks +40% synergy
Triskelavus
33% of 6 decks +33% synergy
Overeager Apprentice
33% of 6 decks +33% synergy
Death Cultist
33% of 6 decks +33% synergy
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33% of 6 decks +33% synergy
Cephalid Inkshrouder
33% of 6 decks +33% synergy
Necrotic Ooze
33% of 6 decks +33% synergy
Minion of Leshrac
33% of 6 decks +33% synergy
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33% of 6 decks +33% synergy
Pili-Pala
33% of 6 decks +33% synergy
Deathbringer Thoctar
33% of 6 decks +33% synergy
Likeness Looter
33% of 3 decks +31% synergy
Displacer Kitten
33% of 6 decks +29% synergy
Jace's Archivist
33% of 6 decks +26% synergy
Thassa's Oracle
33% of 6 decks +25% synergy
Lunar Avenger
17% of 6 decks +17% synergy
Darting Merfolk
17% of 6 decks +17% synergy
Skill Borrower
17% of 6 decks +17% synergy
Cryptic Trilobite
17% of 6 decks +17% synergy
Workhorse
17% of 6 decks +17% synergy
Mogg Fanatic
17% of 6 decks +17% synergy
Carnifex Demon
17% of 6 decks +17% synergy
Knacksaw Clique
17% of 6 decks +17% synergy
Amaranthine Wall
17% of 6 decks +17% synergy
Soul of New Phyrexia
17% of 6 decks +17% synergy
Grinning Ignus
17% of 6 decks +16% synergy
Alchemist's Apprentice
17% of 6 decks +16% synergy
Ovinomancer
17% of 6 decks +16% synergy
Eater of the Dead
17% of 6 decks +16% synergy
Shauku, Endbringer
17% of 6 decks +16% synergy
Mercurial Chemister
17% of 6 decks +16% synergy
Fatestitcher
17% of 6 decks +16% synergy
Doomed Necromancer
17% of 6 decks +16% synergy
Nezahal, Primal Tide
17% of 6 decks +16% synergy
Goro-Goro, Disciple of Ryusei
17% of 6 decks +15% synergy
Instants
Fell the Profane
100% of 1 decks +87% synergy
Sink into Stupor
100% of 1 decks +87% synergy
Entomb
67% of 6 decks +60% synergy
Frantic Search
67% of 6 decks +52% synergy
Fierce Guardianship
67% of 6 decks +48% synergy
Terminate
67% of 6 decks +38% synergy
Counterspell
67% of 6 decks +22% synergy
Intuition
50% of 6 decks +48% synergy
Demand Answers
50% of 2 decks +47% synergy
Ghostly Flicker
50% of 6 decks +43% synergy
Fact or Fiction
50% of 6 decks +37% synergy
Mana Drain
50% of 6 decks +34% synergy
Planar Incision
33% of 6 decks +31% synergy
Izzet Charm
33% of 6 decks +30% synergy
Essence Flux
33% of 6 decks +30% synergy
Swan Song
33% of 6 decks +16% synergy
Vampiric Tutor
33% of 6 decks +14% synergy
Cyclonic Rift
33% of 6 decks +5% synergy
Flame of Anor
25% of 4 decks +18% synergy
Saw in Half
20% of 5 decks +17% synergy
Forbid
17% of 6 decks +16% synergy
First Day of Class
17% of 6 decks +16% synergy
Capsize
17% of 6 decks +16% synergy
Remand
17% of 6 decks +16% synergy
Saw It Coming
17% of 6 decks +16% synergy
Teferi's Time Twist
17% of 6 decks +15% synergy
Fire Covenant
17% of 6 decks +15% synergy
Crosis's Charm
17% of 6 decks +12% synergy
Lightning Bolt
17% of 6 decks +10% synergy
Deadly Rollick
17% of 6 decks +4% synergy
Rakdos Charm
17% of 6 decks +1% synergy
Mystical Tutor
17% of 6 decks +1% synergy
Deflecting Swat
17% of 6 decks +1% synergy
Brainstorm
17% of 6 decks -4% synergy
Negate
17% of 6 decks -7% synergy
Arcane Denial
17% of 6 decks -11% synergy
Dark Ritual
17% of 6 decks -12% synergy
Chaos Warp
17% of 6 decks -25% synergy
Sorceries
Faithless Looting
67% of 6 decks +47% synergy
Demonic Tutor
67% of 6 decks +42% synergy
Cathartic Reunion
50% of 6 decks +48% synergy
Unmarked Grave
50% of 6 decks +48% synergy
Molten Collapse
50% of 2 decks +48% synergy
Careful Study
33% of 6 decks +32% synergy
Grim Tutor
33% of 6 decks +28% synergy
Toxic Deluge
33% of 6 decks +14% synergy
Windfall
33% of 6 decks +9% synergy
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33% of 6 decks -16% synergy
Reckless Handling
25% of 4 decks +24% synergy
Ransack the Lab
17% of 6 decks +17% synergy
Bone Shards
17% of 6 decks +16% synergy
Strategic Planning
17% of 6 decks +16% synergy
Glimpse the Unthinkable
17% of 6 decks +16% synergy
Final Parting
17% of 6 decks +15% synergy
Necromantic Selection
17% of 6 decks +15% synergy
Reforge the Soul
17% of 6 decks +12% synergy
Diabolic Tutor
17% of 6 decks +11% synergy
Wheel of Fortune
17% of 6 decks +8% synergy
Gamble
17% of 6 decks +7% synergy
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17% of 6 decks +6% synergy
Ponder
17% of 6 decks +5% synergy
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17% of 6 decks -2% synergy
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17% of 6 decks -20% synergy
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67% of 6 decks +65% synergy
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50% of 6 decks +50% synergy
Pendant of Prosperity
50% of 6 decks +49% synergy
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Conjurer's Closet
33% of 6 decks +30% synergy
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33% of 6 decks +3% synergy
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17% of 6 decks +17% synergy
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17% of 6 decks +16% synergy
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17% of 6 decks +15% synergy
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17% of 6 decks +13% synergy
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17% of 6 decks -10% synergy
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67% of 6 decks +66% synergy
Rhystic Study
33% of 6 decks +6% synergy
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17% of 6 decks +16% synergy
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17% of 6 decks +16% synergy
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17% of 6 decks +16% synergy
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17% of 6 decks +16% synergy
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17% of 6 decks +16% synergy
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17% of 6 decks +15% synergy
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17% of 6 decks +5% synergy
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17% of 6 decks +1% synergy
Planeswalkers
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20% of 5 decks +19% synergy
Daretti, Scrap Savant
17% of 6 decks +15% synergy
Ashiok, Dream Render
17% of 6 decks +14% synergy
Nicol Bolas, Dragon-God
17% of 6 decks +13% synergy
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67% of 6 decks +63% synergy
Minamo, School at Water's Edge
50% of 6 decks +47% synergy
Otawara, Soaring City
50% of 6 decks +35% synergy
Urborg, Tomb of Yawgmoth
33% of 6 decks +17% synergy
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33% of 6 decks -1% synergy
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17% of 6 decks +16% synergy
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17% of 6 decks +16% synergy
Command Beacon
17% of 6 decks +12% synergy
Vault of Whispers
17% of 6 decks +11% synergy
Great Furnace
17% of 6 decks +11% synergy
Seat of the Synod
17% of 6 decks +11% synergy
Desolate Lighthouse
17% of 6 decks +10% synergy
Temple of the False God
17% of 6 decks +7% synergy
Ancient Tomb
17% of 6 decks +3% synergy
Bojuka Bog
17% of 6 decks -9% synergy
Mana Artifacts
Arcane Signet
83% of 6 decks -4% synergy
Sol Ring
83% of 6 decks -8% synergy
Izzet Signet
50% of 6 decks +9% synergy
Talisman of Creativity
50% of 6 decks +5% synergy
Nyx Lotus
33% of 6 decks +33% synergy
Coveted Jewel
33% of 6 decks +32% synergy
Fellwar Stone
33% of 6 decks -2% synergy
Talisman of Indulgence
33% of 6 decks -6% synergy
Dimir Signet
33% of 6 decks -12% synergy
Talisman of Dominance
33% of 6 decks -13% synergy
Relic of Sauron
25% of 4 decks -2% synergy
Staff of Compleation
20% of 5 decks +19% synergy
Machine God's Effigy
20% of 5 decks +15% synergy
Ventifact Bottle
17% of 6 decks +17% synergy
Patriar's Seal
17% of 6 decks +16% synergy
Chromatic Orrery
17% of 6 decks +16% synergy
Basalt Monolith
17% of 6 decks +14% synergy
Worn Powerstone
17% of 6 decks +10% synergy
Thran Dynamo
17% of 6 decks +10% synergy
Jeweled Lotus
17% of 6 decks +9% synergy
Lotus Petal
17% of 6 decks +8% synergy
Mana Vault
17% of 6 decks +8% synergy
Mana Crypt
17% of 6 decks +3% synergy
Commander's Sphere
17% of 6 decks -10% synergy
Rakdos Signet
17% of 6 decks -27% synergy
Lands
Blood Crypt
67% of 6 decks +23% synergy
Steam Vents
67% of 6 decks +22% synergy
Xander's Lounge
67% of 6 decks +22% synergy
Watery Grave
67% of 6 decks +21% synergy
Command Tower
67% of 6 decks -25% synergy
Thundering Falls
50% of 2 decks +36% synergy
Raucous Theater
50% of 2 decks +34% synergy
Undercity Sewers
50% of 2 decks +33% synergy
Underground River
50% of 6 decks +26% synergy
Polluted Delta
50% of 6 decks +20% synergy
Bloodstained Mire
50% of 6 decks +20% synergy
Scalding Tarn
50% of 6 decks +19% synergy
Luxury Suite
50% of 6 decks +15% synergy
Training Center
50% of 6 decks +14% synergy
Smoldering Marsh
50% of 6 decks +12% synergy
Drowned Catacomb
50% of 6 decks +11% synergy
Dragonskull Summit
50% of 6 decks +9% synergy
Sunken Hollow
50% of 6 decks +8% synergy
Exotic Orchard
50% of 6 decks -7% synergy
Wooded Foothills
33% of 6 decks +25% synergy
Verdant Catacombs
33% of 6 decks +24% synergy
Flooded Strand
33% of 6 decks +24% synergy
Marsh Flats
33% of 6 decks +23% synergy
City of Brass
33% of 6 decks +20% synergy
Volcanic Island
33% of 6 decks +19% synergy
Underground Sea
33% of 6 decks +19% synergy
Badlands
33% of 6 decks +19% synergy
Maestros Theater
33% of 6 decks +19% synergy
Stormcarved Coast
33% of 6 decks +11% synergy
Sulfurous Springs
33% of 6 decks +10% synergy
Terramorphic Expanse
33% of 6 decks +9% synergy
Shivan Reef
33% of 6 decks +5% synergy
Morphic Pool
33% of 6 decks -1% synergy
Sulfur Falls
33% of 6 decks -8% synergy
Crumbling Necropolis
33% of 6 decks -25% synergy
Grixis Panorama
17% of 6 decks +10% synergy
Arid Mesa
17% of 6 decks +7% synergy
Misty Rainforest
17% of 6 decks +7% synergy
Mana Confluence
17% of 6 decks +4% synergy
Rakdos Carnarium
17% of 6 decks +2% synergy
Myriad Landscape
17% of 6 decks +2% synergy
Izzet Boilerworks
17% of 6 decks +1% synergy
Dimir Aqueduct
17% of 6 decks +1% synergy
Haunted Ridge
17% of 6 decks -4% synergy
Shipwreck Marsh
17% of 6 decks -9% synergy
Evolving Wilds
17% of 6 decks -11% synergy