Mairsil, the Pretender + Endling + Cauldron of Souls + Blood Vassal + Anger

Mairsil, the Pretender
Endling
Cauldron of Souls
Blood Vassal
Anger

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. Anger must be in the graveyard. You control a Mountain.
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
1.15% of 1568 decks 18 decks
New Cards
Marvin, Murderous Mimic
100% of 4 decks +99% synergy
High Synergy Cards
Aetherling
100% of 18 decks +99% synergy
Nevinyrral's Disk
94% of 18 decks +93% synergy
Arcanis the Omnipotent
89% of 18 decks +87% synergy
Torchling
83% of 18 decks +83% synergy
Asmodeus the Archfiend
83% of 18 decks +83% synergy
Unmarked Grave
83% of 18 decks +81% synergy
Buried Alive
83% of 18 decks +79% synergy
Cinderhaze Wretch
78% of 18 decks +78% synergy
Quicksilver Elemental
78% of 18 decks +77% synergy
Cavern Harpy
78% of 18 decks +77% synergy
Top Cards
Gilded Lotus
83% of 18 decks +79% synergy
Staff of Domination
72% of 18 decks +72% synergy
Oriq Loremage
72% of 18 decks +71% synergy
Windfall
72% of 18 decks +48% synergy
Morphling
67% of 18 decks +66% synergy
Faithless Looting
67% of 18 decks +47% synergy
Pendant of Prosperity
61% of 18 decks +61% synergy
Walking Ballista
61% of 18 decks +60% synergy
Entomb
61% of 18 decks +55% synergy
Hateflayer
56% of 18 decks +55% synergy
Creatures
Ulamog's Dreadsire
75% of 4 decks +75% synergy
Tree of Perdition
56% of 18 decks +55% synergy
Horseshoe Crab
50% of 18 decks +50% synergy
Pack Rat
50% of 18 decks +48% synergy
Ovinomancer
44% of 18 decks +44% synergy
Pili-Pala
44% of 18 decks +44% synergy
Jace's Archivist
44% of 18 decks +37% synergy
Argivian Avenger
33% of 15 decks +33% synergy
Anthroplasm
33% of 18 decks +33% synergy
Crystalline Crawler
33% of 18 decks +33% synergy
Mirror-Mad Phantasm
33% of 18 decks +33% synergy
Eater of the Dead
33% of 18 decks +33% synergy
Shauku, Endbringer
33% of 18 decks +33% synergy
Myr Propagator
28% of 18 decks +28% synergy
Sage of Hours
28% of 18 decks +28% synergy
Minion of Leshrac
28% of 18 decks +28% synergy
Blood Pet
28% of 18 decks +27% synergy
Thassa, Deep-Dwelling
28% of 18 decks +24% synergy
Blighted Bat
22% of 18 decks +22% synergy
Grinning Ignus
22% of 18 decks +22% synergy
Spikeshot Elder
22% of 18 decks +22% synergy
Cephalid Inkshrouder
22% of 18 decks +22% synergy
Triskelion
22% of 18 decks +22% synergy
Deathbringer Thoctar
22% of 18 decks +22% synergy
Mercurial Chemister
22% of 18 decks +22% synergy
Goro-Goro, Disciple of Ryusei
22% of 18 decks +21% synergy
Spark Double
22% of 18 decks +14% synergy
Omen Hawker
21% of 14 decks +21% synergy
Shriekdiver
17% of 18 decks +17% synergy
Farmstead Gleaner
17% of 18 decks +17% synergy
Patron of the Moon
17% of 18 decks +17% synergy
Magus of the Bazaar
17% of 18 decks +17% synergy
Dralnu, Lich Lord
17% of 18 decks +16% synergy
Argent Sphinx
17% of 18 decks +16% synergy
Necrotic Ooze
17% of 18 decks +16% synergy
Doom Whisperer
17% of 18 decks +15% synergy
Galecaster Colossus
17% of 18 decks +15% synergy
Displacer Kitten
17% of 18 decks +13% synergy
Instants
Frantic Search
56% of 18 decks +42% synergy
Vampiric Tutor
44% of 18 decks +26% synergy
Counterspell
44% of 18 decks -0% synergy
Mana Drain
39% of 18 decks +23% synergy
Essence Flux
33% of 18 decks +30% synergy
Thrill of Possibility
33% of 18 decks +25% synergy
Mystical Tutor
33% of 18 decks +18% synergy
Blur
28% of 18 decks +27% synergy
Planar Incision
28% of 18 decks +26% synergy
Ghostly Flicker
28% of 18 decks +21% synergy
An Offer You Can't Refuse
28% of 18 decks +6% synergy
Arcane Denial
28% of 18 decks -0% synergy
Intuition
22% of 18 decks +20% synergy
Thirst for Knowledge
22% of 18 decks +20% synergy
Fact or Fiction
22% of 18 decks +10% synergy
Swan Song
22% of 18 decks +5% synergy
Negate
22% of 18 decks -2% synergy
Cyclonic Rift
22% of 18 decks -6% synergy
Dark Ritual
22% of 18 decks -7% synergy
Chaos Warp
22% of 18 decks -18% synergy
Teferi's Time Twist
17% of 18 decks +15% synergy
Crosis's Charm
17% of 18 decks +13% synergy
Malakir Rebirth
17% of 18 decks +11% synergy
Deflecting Swat
17% of 18 decks +0% synergy
Fierce Guardianship
17% of 18 decks -2% synergy
Brainstorm
17% of 18 decks -3% synergy
Terminate
17% of 18 decks -12% synergy
Sorceries
Gamble
56% of 18 decks +46% synergy
Demonic Tutor
50% of 18 decks +26% synergy
Final Parting
33% of 18 decks +32% synergy
Careful Study
33% of 18 decks +32% synergy
Cathartic Reunion
33% of 18 decks +32% synergy
Feed the Swarm
33% of 18 decks -2% synergy
Blasphemous Act
33% of 18 decks -16% synergy
Grim Tutor
28% of 18 decks +23% synergy
Wheel of Fortune
28% of 18 decks +19% synergy
Reckless Handling
25% of 12 decks +24% synergy
Ponder
22% of 18 decks +11% synergy
Toxic Deluge
22% of 18 decks +2% synergy
Consuming Tide
17% of 18 decks +16% synergy
Necromantic Selection
17% of 18 decks +16% synergy
Imperial Seal
17% of 18 decks +10% synergy
Damnation
17% of 18 decks +6% synergy
Vandalblast
17% of 18 decks -1% synergy
Utility Artifacts
Thousand-Year Elixir
56% of 18 decks +54% synergy
Conjurer's Closet
39% of 18 decks +36% synergy
Mirage Mirror
33% of 18 decks +32% synergy
Phyrexian Altar
33% of 18 decks +29% synergy
Swiftfoot Boots
33% of 18 decks +7% synergy
The One Ring
29% of 14 decks +14% synergy
Lightning Greaves
22% of 18 decks -7% synergy
Netherborn Altar
17% of 18 decks +16% synergy
Heartstone
17% of 18 decks +16% synergy
Enchantments
Rising of the Day
50% of 12 decks +45% synergy
Training Grounds
28% of 18 decks +27% synergy
Rhystic Study
28% of 18 decks +1% synergy
Candlekeep Sage
22% of 18 decks +22% synergy
Propaganda
17% of 18 decks +4% synergy
Utility Lands
Riptide Laboratory
61% of 18 decks +58% synergy
Minamo, School at Water's Edge
44% of 18 decks +42% synergy
Sanctum of Eternity
33% of 18 decks +33% synergy
Otawara, Soaring City
33% of 18 decks +18% synergy
Vault of Whispers
28% of 18 decks +22% synergy
Great Furnace
28% of 18 decks +22% synergy
Seat of the Synod
28% of 18 decks +22% synergy
Bojuka Bog
28% of 18 decks +2% synergy
Flamekin Village
22% of 18 decks +22% synergy
Command Beacon
22% of 18 decks +18% synergy
Reliquary Tower
22% of 18 decks -12% synergy
Desolate Lighthouse
17% of 18 decks +10% synergy
Geier Reach Sanitarium
17% of 18 decks +10% synergy
Urborg, Tomb of Yawgmoth
17% of 18 decks +1% synergy
Mana Artifacts
Arcane Signet
78% of 18 decks -11% synergy
Sol Ring
78% of 18 decks -13% synergy
Talisman of Dominance
56% of 18 decks +8% synergy
Izzet Signet
50% of 18 decks +10% synergy
Dimir Signet
50% of 18 decks +6% synergy
Talisman of Creativity
50% of 18 decks +5% synergy
Coveted Jewel
44% of 18 decks +43% synergy
Fellwar Stone
39% of 18 decks +4% synergy
Talisman of Indulgence
39% of 18 decks -1% synergy
Basalt Monolith
33% of 18 decks +31% synergy
Nyx Lotus
22% of 18 decks +22% synergy
Chromatic Orrery
22% of 18 decks +21% synergy
Rakdos Signet
22% of 18 decks -20% synergy
Prismatic Geoscope
17% of 18 decks +17% synergy
Commander's Sphere
17% of 18 decks -9% synergy
Lands
Command Tower
83% of 18 decks -9% synergy
Thundering Falls
75% of 8 decks +62% synergy
Undercity Sewers
75% of 8 decks +60% synergy
Xander's Lounge
67% of 18 decks +23% synergy
Blood Crypt
61% of 18 decks +17% synergy
Steam Vents
61% of 18 decks +17% synergy
Watery Grave
61% of 18 decks +16% synergy
Raucous Theater
50% of 8 decks +36% synergy
Training Center
50% of 18 decks +15% synergy
Exotic Orchard
50% of 18 decks -7% synergy
Polluted Delta
44% of 18 decks +14% synergy
Scalding Tarn
44% of 18 decks +14% synergy
Misty Rainforest
39% of 18 decks +29% synergy
Bloodstained Mire
39% of 18 decks +8% synergy
Luxury Suite
39% of 18 decks +5% synergy
Morphic Pool
39% of 18 decks +5% synergy
Flooded Strand
33% of 18 decks +23% synergy
Marsh Flats
33% of 18 decks +23% synergy
City of Brass
33% of 18 decks +20% synergy
Sulfur Falls
33% of 18 decks -9% synergy
Wooded Foothills
28% of 18 decks +20% synergy
Verdant Catacombs
28% of 18 decks +18% synergy
Badlands
28% of 18 decks +14% synergy
Smoldering Marsh
28% of 18 decks -11% synergy
Drowned Catacomb
28% of 18 decks -12% synergy
Dragonskull Summit
28% of 18 decks -14% synergy
Sunken Hollow
28% of 18 decks -14% synergy
Cavern of Souls
22% of 18 decks +16% synergy
Arid Mesa
22% of 18 decks +13% synergy
Mana Confluence
22% of 18 decks +10% synergy
Volcanic Island
22% of 18 decks +8% synergy
Underground Sea
22% of 18 decks +8% synergy
Crumbling Necropolis
22% of 18 decks -37% synergy
Maestros Theater
17% of 18 decks +3% synergy
Rakdos Carnarium
17% of 18 decks +2% synergy
Izzet Boilerworks
17% of 18 decks +2% synergy
Dimir Aqueduct
17% of 18 decks +2% synergy
Temple of Deceit
17% of 18 decks +1% synergy
Temple of Epiphany
17% of 18 decks -1% synergy
Terramorphic Expanse
17% of 18 decks -7% synergy
Underground River
17% of 18 decks -8% synergy