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

Mairsil, the Pretender
Endling
Cauldron of Souls
Blood Vassal
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 Vassal 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 Vassal'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 Vassal'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
0.76% of 1576 decks 12 decks
High Synergy Cards
Nevinyrral's Disk
100% of 12 decks +99% synergy
Asmodeus the Archfiend
92% of 12 decks +91% synergy
Aetherling
92% of 12 decks +91% synergy
Torchling
83% of 12 decks +83% synergy
Hateflayer
75% of 12 decks +75% synergy
Quicksilver Elemental
75% of 12 decks +75% synergy
Staff of Domination
75% of 12 decks +74% synergy
Oriq Loremage
75% of 12 decks +74% synergy
Anger
83% of 12 decks +74% synergy
Arcanis the Omnipotent
75% of 12 decks +73% synergy
Top Cards
Gilded Lotus
83% of 12 decks +79% synergy
Pack Rat
75% of 12 decks +73% synergy
Buried Alive
75% of 12 decks +71% synergy
Cinderhaze Wretch
67% of 12 decks +67% synergy
Tree of Perdition
67% of 12 decks +66% synergy
Walking Ballista
67% of 12 decks +66% synergy
Blood Pet
58% of 12 decks +58% synergy
Horseshoe Crab
58% of 12 decks +58% synergy
Cavern Harpy
58% of 12 decks +58% synergy
Pendant of Prosperity
58% of 12 decks +58% synergy
Creatures
Jace's Archivist
58% of 12 decks +51% synergy
Crystalline Crawler
50% of 12 decks +50% synergy
Morphling
50% of 12 decks +50% synergy
Triskelion
50% of 12 decks +50% synergy
Magus of the Bazaar
42% of 12 decks +42% synergy
Spikeshot Elder
42% of 12 decks +41% synergy
Ovinomancer
42% of 12 decks +41% synergy
Deathbringer Thoctar
42% of 12 decks +41% synergy
Anthroplasm
33% of 12 decks +33% synergy
Argent Sphinx
33% of 12 decks +33% synergy
Cephalid Inkshrouder
33% of 12 decks +33% synergy
Mirror-Mad Phantasm
33% of 12 decks +33% synergy
Eater of the Dead
33% of 12 decks +33% synergy
Shauku, Endbringer
33% of 12 decks +33% synergy
Pili-Pala
33% of 12 decks +33% synergy
Mercurial Chemister
33% of 12 decks +33% synergy
Triskelavus
25% of 12 decks +25% synergy
Blighted Bat
25% of 12 decks +25% synergy
Sage of Hours
25% of 12 decks +25% synergy
Galecaster Colossus
25% of 12 decks +24% synergy
Goro-Goro, Disciple of Ryusei
25% of 12 decks +23% synergy
Instants
Entomb
58% of 12 decks +52% synergy
Frantic Search
50% of 12 decks +36% synergy
Counterspell
42% of 12 decks -3% synergy
Blur
33% of 12 decks +32% synergy
Essence Flux
33% of 12 decks +30% synergy
Ghostly Flicker
33% of 12 decks +27% synergy
Thrill of Possibility
33% of 12 decks +25% synergy
Fact or Fiction
33% of 12 decks +21% synergy
Mana Drain
33% of 12 decks +17% synergy
Vampiric Tutor
33% of 12 decks +15% synergy
Terminate
33% of 12 decks +5% synergy
Teferi's Time Twist
25% of 12 decks +23% synergy
Planar Incision
25% of 12 decks +23% synergy
Intuition
25% of 12 decks +23% synergy
Thirst for Knowledge
25% of 12 decks +22% synergy
Izzet Charm
25% of 12 decks +22% synergy
Deflecting Swat
25% of 12 decks +9% synergy
Swan Song
25% of 12 decks +8% synergy
Fierce Guardianship
25% of 12 decks +6% synergy
An Offer You Can't Refuse
25% of 12 decks +3% synergy
Dark Ritual
25% of 12 decks -4% synergy
Chaos Warp
25% of 12 decks -16% synergy
Sorceries
Unmarked Grave
58% of 12 decks +56% synergy
Faithless Looting
58% of 12 decks +38% synergy
Windfall
58% of 12 decks +34% synergy
Demonic Tutor
50% of 12 decks +26% synergy
Cathartic Reunion
42% of 12 decks +40% synergy
Gamble
42% of 12 decks +32% synergy
Blasphemous Act
42% of 12 decks -8% synergy
Final Parting
33% of 12 decks +32% synergy
Grim Tutor
33% of 12 decks +29% synergy
Reckless Handling
30% of 10 decks +29% synergy
Careful Study
25% of 12 decks +24% synergy
Wheel of Fortune
25% of 12 decks +16% synergy
Ponder
25% of 12 decks +14% synergy
Vandalblast
25% of 12 decks +7% synergy
Toxic Deluge
25% of 12 decks +5% synergy
Feed the Swarm
25% of 12 decks -11% synergy
Utility Artifacts
The One Ring
50% of 10 decks +35% synergy
Conjurer's Closet
42% of 12 decks +38% synergy
Mirage Mirror
33% of 12 decks +32% synergy
Swiftfoot Boots
33% of 12 decks +7% synergy
Heartstone
25% of 12 decks +25% synergy
Phyrexian Altar
25% of 12 decks +21% synergy
Enchantments
Rising of the Day
40% of 10 decks +35% synergy
Training Grounds
33% of 12 decks +33% synergy
Rhystic Study
25% of 12 decks -2% synergy
Utility Lands
Riptide Laboratory
58% of 12 decks +55% synergy
Sanctum of Eternity
33% of 12 decks +33% synergy
Minamo, School at Water's Edge
33% of 12 decks +31% synergy
Vault of Whispers
33% of 12 decks +28% synergy
Great Furnace
33% of 12 decks +28% synergy
Seat of the Synod
33% of 12 decks +27% synergy
Reliquary Tower
33% of 12 decks -1% synergy
Desolate Lighthouse
25% of 12 decks +18% synergy
Geier Reach Sanitarium
25% of 12 decks +18% synergy
Mana Artifacts
Arcane Signet
83% of 12 decks -5% synergy
Sol Ring
83% of 12 decks -8% synergy
Izzet Signet
67% of 12 decks +27% synergy
Dimir Signet
67% of 12 decks +23% synergy
Talisman of Creativity
58% of 12 decks +14% synergy
Talisman of Dominance
58% of 12 decks +11% synergy
Talisman of Indulgence
42% of 12 decks +2% synergy
Fellwar Stone
33% of 12 decks -2% synergy
Nyx Lotus
25% of 12 decks +25% synergy
Coveted Jewel
25% of 12 decks +24% synergy
Basalt Monolith
25% of 12 decks +22% synergy
Rakdos Signet
25% of 12 decks -17% synergy
Lands
Thundering Falls
67% of 6 decks +53% synergy
Undercity Sewers
67% of 6 decks +51% synergy
Command Tower
67% of 12 decks -25% synergy
Blood Crypt
58% of 12 decks +15% synergy
Xander's Lounge
58% of 12 decks +14% synergy
Steam Vents
58% of 12 decks +14% synergy
Watery Grave
58% of 12 decks +13% synergy
Raucous Theater
50% of 6 decks +36% synergy
Exotic Orchard
42% of 12 decks -16% synergy
Polluted Delta
33% of 12 decks +3% synergy
Bloodstained Mire
33% of 12 decks +3% synergy
Scalding Tarn
33% of 12 decks +2% synergy
Training Center
33% of 12 decks -2% synergy
Dragonskull Summit
33% of 12 decks -8% synergy
Flooded Strand
25% of 12 decks +15% synergy
Misty Rainforest
25% of 12 decks +15% synergy
Marsh Flats
25% of 12 decks +15% synergy
City of Brass
25% of 12 decks +11% synergy
Underground River
25% of 12 decks +0% synergy
Luxury Suite
25% of 12 decks -9% synergy
Morphic Pool
25% of 12 decks -9% synergy
Smoldering Marsh
25% of 12 decks -14% synergy
Drowned Catacomb
25% of 12 decks -14% synergy
Sunken Hollow
25% of 12 decks -17% synergy
Sulfur Falls
25% of 12 decks -17% synergy