Mairsil, the Pretender
Endling
Cauldron of Souls
Blood Vassal
Thousand-Year Elixir
1

   Prerequisites

What do I need to start this combo?
Mairsil and Thousand-Year Elixir on the battlefield.
All other permanents in exile.

   Steps

How does this combo work?
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

What do I get from this combo?
Infinite black mana
Infinite death triggers
Infinite ETB
Infinite LTB
Infinite sacrifice triggers
Mairsil, the Pretender
0.87% of 1607 decks 14 decks
High Synergy Cards
Nevinyrral's Disk
100% of 14 decks +99% synergy
Torchling
93% of 14 decks +92% synergy
Aetherling
93% of 14 decks +92% synergy
Quicksilver Elemental
86% of 14 decks +85% synergy
Asmodeus the Archfiend
86% of 14 decks +85% synergy
Pendant of Prosperity
79% of 14 decks +78% synergy
Tree of Perdition
79% of 14 decks +78% synergy
Staff of Domination
79% of 14 decks +78% synergy
Arcanis the Omnipotent
79% of 14 decks +77% synergy
Morphling
71% of 14 decks +71% synergy
Top Cards
Anger
79% of 14 decks +69% synergy
Hateflayer
71% of 14 decks +71% synergy
Pack Rat
71% of 14 decks +69% synergy
Buried Alive
71% of 14 decks +67% synergy
Horseshoe Crab
64% of 14 decks +64% synergy
Cavern Harpy
64% of 14 decks +64% synergy
Oriq Loremage
64% of 14 decks +64% synergy
Cinderhaze Wretch
57% of 14 decks +57% synergy
Ovinomancer
57% of 14 decks +57% synergy
Walking Ballista
57% of 14 decks +57% synergy
Game Changers
Gamble
36% of 14 decks +27% synergy
The One Ring
36% of 14 decks +22% synergy
Demonic Tutor
36% of 14 decks +13% synergy
Intuition
29% of 14 decks +27% synergy
Vampiric Tutor
21% of 14 decks +4% synergy
Fierce Guardianship
21% of 14 decks +3% synergy
Creatures
Crystalline Crawler
50% of 14 decks +50% synergy
Blood Pet
50% of 14 decks +50% synergy
Anthroplasm
43% of 14 decks +43% synergy
Cephalid Inkshrouder
43% of 14 decks +43% synergy
Triskelion
43% of 14 decks +43% synergy
Marvin, Murderous Mimic
43% of 7 decks +42% synergy
Jace's Archivist
43% of 14 decks +36% synergy
Magus of the Bazaar
36% of 14 decks +36% synergy
Spikeshot Elder
36% of 14 decks +36% synergy
Argent Sphinx
36% of 14 decks +36% synergy
Shauku, Endbringer
36% of 14 decks +35% synergy
Sage of Hours
29% of 14 decks +28% synergy
Eater of the Dead
29% of 14 decks +28% synergy
Deathbringer Thoctar
29% of 14 decks +28% synergy
Mercurial Chemister
29% of 14 decks +28% synergy
Displacer Kitten
29% of 14 decks +25% synergy
Triskelavus
21% of 14 decks +21% synergy
Arco-Flagellant
21% of 14 decks +21% synergy
Soliton
21% of 14 decks +21% synergy
Dralnu, Lich Lord
21% of 14 decks +21% synergy
Mirror-Mad Phantasm
21% of 14 decks +21% synergy
Minion of Leshrac
21% of 14 decks +21% synergy
Pili-Pala
21% of 14 decks +21% synergy
Avatar of Woe
21% of 14 decks +21% synergy
Galecaster Colossus
21% of 14 decks +20% synergy
Goro-Goro, Disciple of Ryusei
21% of 14 decks +20% synergy
Thassa, Deep-Dwelling
21% of 14 decks +18% synergy
Spark Double
21% of 14 decks +13% synergy
Instants
Entomb
57% of 14 decks +51% synergy
Frantic Search
50% of 14 decks +36% synergy
Essence Flux
43% of 14 decks +40% synergy
Ghostly Flicker
43% of 14 decks +37% synergy
Teferi's Time Twist
36% of 14 decks +34% synergy
Fact or Fiction
36% of 14 decks +25% synergy
Terminate
36% of 14 decks +8% synergy
Planar Incision
29% of 14 decks +27% synergy
Thrill of Possibility
29% of 14 decks +20% synergy
Mana Drain
29% of 14 decks +13% synergy
An Offer You Can't Refuse
29% of 14 decks +6% synergy
Arcane Denial
29% of 14 decks -0% synergy
Thirst for Knowledge
21% of 14 decks +19% synergy
Crosis's Charm
21% of 14 decks +18% synergy
Swan Song
21% of 14 decks +5% synergy
Negate
21% of 14 decks -2% synergy
Chaos Warp
21% of 14 decks -18% synergy
Counterspell
21% of 14 decks -23% synergy
Sorceries
Faithless Looting
57% of 14 decks +38% synergy
Unmarked Grave
50% of 14 decks +48% synergy
Windfall
43% of 14 decks +20% synergy
Cathartic Reunion
36% of 14 decks +34% synergy
Vandalblast
36% of 14 decks +19% synergy
Reckless Handling
29% of 14 decks +28% synergy
Final Parting
29% of 14 decks +28% synergy
Careful Study
29% of 14 decks +27% synergy
Feed the Swarm
29% of 14 decks -6% synergy
Blasphemous Act
29% of 14 decks -20% synergy
Grim Tutor
21% of 14 decks +17% synergy
Toxic Deluge
21% of 14 decks +1% synergy
Utility Artifacts
Conjurer's Closet
50% of 14 decks +47% synergy
Mirage Mirror
43% of 14 decks +42% synergy
Swiftfoot Boots
43% of 14 decks +17% synergy
Heartstone
21% of 14 decks +21% synergy
Collector's Vault
21% of 14 decks +21% synergy
Phyrexian Altar
21% of 14 decks +18% synergy
Wayfarer's Bauble
21% of 14 decks +5% synergy
Lightning Greaves
21% of 14 decks -8% synergy
Enchantments
Training Grounds
43% of 14 decks +42% synergy
Rising of the Day
29% of 14 decks +25% synergy
Propaganda
21% of 14 decks +8% synergy
Utility Lands
Riptide Laboratory
71% of 14 decks +68% synergy
Sanctum of Eternity
50% of 14 decks +50% synergy
Minamo, School at Water's Edge
43% of 14 decks +40% synergy
Great Furnace
43% of 14 decks +38% synergy
Seat of the Synod
43% of 14 decks +38% synergy
Vault of Whispers
36% of 14 decks +31% synergy
Reliquary Tower
36% of 14 decks +1% synergy
Desolate Lighthouse
29% of 14 decks +21% synergy
Command Beacon
21% of 14 decks +17% synergy
Mana Artifacts
Gilded Lotus
86% of 14 decks +82% synergy
Arcane Signet
86% of 14 decks -2% synergy
Sol Ring
86% of 14 decks -5% synergy
Talisman of Creativity
57% of 14 decks +13% synergy
Talisman of Dominance
57% of 14 decks +10% synergy
Izzet Signet
50% of 14 decks +12% synergy
Dimir Signet
50% of 14 decks +8% synergy
Fellwar Stone
43% of 14 decks +8% synergy
Talisman of Indulgence
43% of 14 decks +3% synergy
Nyx Lotus
21% of 14 decks +21% synergy
Coveted Jewel
21% of 14 decks +20% synergy
Basalt Monolith
21% of 14 decks +19% synergy
Rakdos Signet
21% of 14 decks -19% synergy
Lands
Command Tower
71% of 14 decks -20% synergy
Xander's Lounge
57% of 14 decks +15% synergy
Steam Vents
57% of 14 decks +14% synergy
Watery Grave
57% of 14 decks +13% synergy
Blood Crypt
50% of 14 decks +7% synergy
Exotic Orchard
50% of 14 decks -7% synergy
Crumbling Necropolis
43% of 14 decks -16% synergy
Thundering Falls
36% of 11 decks +27% synergy
Underground River
36% of 14 decks +10% synergy
Shivan Reef
36% of 14 decks +8% synergy
Drowned Catacomb
36% of 14 decks -5% synergy
Dragonskull Summit
36% of 14 decks -8% synergy
Sulfur Falls
36% of 14 decks -8% synergy
Scalding Tarn
29% of 14 decks -2% synergy
Luxury Suite
29% of 14 decks -5% synergy
Smoldering Marsh
29% of 14 decks -11% synergy
Sunken Hollow
29% of 14 decks -14% synergy
Raucous Theater
27% of 11 decks +17% synergy
Undercity Sewers
27% of 11 decks +16% synergy
Mistvault Bridge
21% of 14 decks +17% synergy
Grixis Panorama
21% of 14 decks +16% synergy
Fabled Passage
21% of 14 decks +14% synergy
Misty Rainforest
21% of 14 decks +12% synergy
Marsh Flats
21% of 14 decks +12% synergy
Temple of Epiphany
21% of 14 decks +5% synergy
Haunted Ridge
21% of 14 decks +1% synergy
Stormcarved Coast
21% of 14 decks -1% synergy
Terramorphic Expanse
21% of 14 decks -2% synergy
Shipwreck Marsh
21% of 14 decks -4% synergy
Sulfurous Springs
21% of 14 decks -4% synergy
Polluted Delta
21% of 14 decks -10% synergy
Bloodstained Mire
21% of 14 decks -10% synergy
Morphic Pool
21% of 14 decks -12% synergy
Training Center
21% of 14 decks -13% synergy