Mairsil, the Pretender
Endling
Cauldron of Souls
Blood Vassal
Fervor

   Prerequisites

What do I need to start this combo?
Mairsil and Fervor 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
0.2%inclusion3 decks1.84K decks
Creatures
Aetherling
100%inclusion3 decks3 decks
100%synergy
Anger
100%inclusion3 decks3 decks
89%synergy
Arcanis the Omnipotent
100%inclusion3 decks3 decks
99%synergy
Asmodeus the Archfiend
100%inclusion3 decks3 decks
100%synergy
Quicksilver Elemental
100%inclusion3 decks3 decks
100%synergy
Torchling
100%inclusion3 decks3 decks
100%synergy
Tree of Perdition
100%inclusion3 decks3 decks
100%synergy
Joo Dee, One of Many
100%inclusion1 decks1 decks
100%synergy
Anthroplasm
67%inclusion2 decks3 decks
67%synergy
Cavern Harpy
67%inclusion2 decks3 decks
66%synergy
Doom Whisperer
67%inclusion2 decks3 decks
66%synergy
Eater of the Dead
67%inclusion2 decks3 decks
66%synergy
Empress Galina
67%inclusion2 decks3 decks
66%synergy
Ledger Shredder
67%inclusion2 decks3 decks
64%synergy
Marvin, Murderous Mimic
67%inclusion2 decks3 decks
66%synergy
Morphling
67%inclusion2 decks3 decks
66%synergy
Oriq Loremage
67%inclusion2 decks3 decks
66%synergy
Sage of Hours
67%inclusion2 decks3 decks
67%synergy
Cephalid Inkshrouder
67%inclusion2 decks3 decks
66%synergy
Hateflayer
67%inclusion2 decks3 decks
66%synergy
Pack Rat
67%inclusion2 decks3 decks
64%synergy
Shauku, Endbringer
67%inclusion2 decks3 decks
66%synergy
Triskelion
67%inclusion2 decks3 decks
66%synergy
Visara the Dreadful
67%inclusion2 decks3 decks
67%synergy
Vivi Ornitier
50%inclusion1 decks2 decks
42%synergy
Arcum Dagsson
33%inclusion1 decks3 decks
33%synergy
Auton Soldier
33%inclusion1 decks3 decks
30%synergy
Chainer, Dementia Master
33%inclusion1 decks3 decks
33%synergy
Dimir Doppelganger
33%inclusion1 decks3 decks
33%synergy
Faerie Mastermind
33%inclusion1 decks3 decks
26%synergy
Patron of the Moon
33%inclusion1 decks3 decks
33%synergy
Skirge Familiar
33%inclusion1 decks3 decks
32%synergy
Thassa, Deep-Dwelling
33%inclusion1 decks3 decks
30%synergy
Argent Sphinx
33%inclusion1 decks3 decks
33%synergy
Blood Pet
33%inclusion1 decks3 decks
33%synergy
Harmonic Prodigy
33%inclusion1 decks3 decks
24%synergy
Identity Thief
33%inclusion1 decks3 decks
32%synergy
Magus of the Wheel
33%inclusion1 decks3 decks
26%synergy
Naban, Dean of Iteration
33%inclusion1 decks3 decks
30%synergy
Sakashima the Impostor
33%inclusion1 decks3 decks
32%synergy
Spark Double
33%inclusion1 decks3 decks
26%synergy
Walking Ballista
33%inclusion1 decks3 decks
33%synergy
Necrotic Ooze
33%inclusion1 decks3 decks
33%synergy
Galecaster Colossus
33%inclusion1 decks3 decks
32%synergy
Memnarch
33%inclusion1 decks3 decks
33%synergy
Feldon of the Third Path
33%inclusion1 decks3 decks
31%synergy
Displacer Kitten
33%inclusion1 decks3 decks
28%synergy
Horseshoe Crab
33%inclusion1 decks3 decks
33%synergy
Ovinomancer
33%inclusion1 decks3 decks
33%synergy
Crystalline Crawler
33%inclusion1 decks3 decks
33%synergy
Instants
Essence Flux
100%inclusion3 decks3 decks
94%synergy
Teferi's Time Twist
100%inclusion3 decks3 decks
98%synergy
An Offer You Can't Refuse
67%inclusion2 decks3 decks
38%synergy
Frantic Search
67%inclusion2 decks3 decks
48%synergy
Malakir Rebirth
67%inclusion2 decks3 decks
60%synergy
Planar Incision
67%inclusion2 decks3 decks
65%synergy
Entomb
67%inclusion2 decks3 decks
61%synergy
Deflecting Swat
33%inclusion1 decks3 decks
15%synergy
Fierce Guardianship
33%inclusion1 decks3 decks
14%synergy
Gifts Ungiven
33%inclusion1 decks3 decks
31%synergy
Intuition
33%inclusion1 decks3 decks
32%synergy
Saw in Half
33%inclusion1 decks3 decks
29%synergy
Swan Song
33%inclusion1 decks3 decks
14%synergy
Tolarian Winds
33%inclusion1 decks3 decks
32%synergy
Valakut Awakening
33%inclusion1 decks3 decks
30%synergy
Arcane Denial
33%inclusion1 decks3 decks
5%synergy
Blur
33%inclusion1 decks3 decks
32%synergy
Counterspell
33%inclusion1 decks3 decks
-11%synergy
Crosis's Charm
33%inclusion1 decks3 decks
31%synergy
Thrill of Possibility
33%inclusion1 decks3 decks
23%synergy
Ghostly Flicker
33%inclusion1 decks3 decks
27%synergy
Fact or Fiction
33%inclusion1 decks3 decks
26%synergy
Untimely Malfunction
33%inclusion1 decks3 decks
28%synergy
Sorceries
Buried Alive
100%inclusion3 decks3 decks
96%synergy
Careful Study
67%inclusion2 decks3 decks
65%synergy
Reckless Handling
67%inclusion2 decks3 decks
66%synergy
Cut // Ribbons
33%inclusion1 decks3 decks
33%synergy
Exsanguinate
33%inclusion1 decks3 decks
30%synergy
Fabricate
33%inclusion1 decks3 decks
30%synergy
Splash Portal
33%inclusion1 decks3 decks
32%synergy
Unmarked Grave
33%inclusion1 decks3 decks
32%synergy
Windfall
33%inclusion1 decks3 decks
10%synergy
Gamble
33%inclusion1 decks3 decks
23%synergy
Faithless Looting
33%inclusion1 decks3 decks
14%synergy
Utility Artifacts
Nevinyrral's Disk
100%inclusion3 decks3 decks
99%synergy
Mirage Mirror
67%inclusion2 decks3 decks
66%synergy
The One Ring
67%inclusion2 decks3 decks
54%synergy
Thousand-Year Elixir
67%inclusion2 decks3 decks
66%synergy
Pendant of Prosperity
67%inclusion2 decks3 decks
66%synergy
Staff of Domination
67%inclusion2 decks3 decks
66%synergy
Swiftfoot Boots
67%inclusion2 decks3 decks
40%synergy
Conjurer's Closet
33%inclusion1 decks3 decks
29%synergy
Illusionist's Bracers
33%inclusion1 decks3 decks
33%synergy
Sensei's Divining Top
33%inclusion1 decks3 decks
30%synergy
Wizard's Spellbook
33%inclusion1 decks3 decks
33%synergy
Ashnod's Altar
33%inclusion1 decks3 decks
27%synergy
Lightning Greaves
33%inclusion1 decks3 decks
4%synergy
Voyager Staff
33%inclusion1 decks3 decks
33%synergy
Crystal Shard
33%inclusion1 decks3 decks
33%synergy
Rings of Brighthearth
33%inclusion1 decks3 decks
32%synergy
Agatha's Soul Cauldron
33%inclusion1 decks3 decks
32%synergy
Monument to Endurance
33%inclusion1 decks3 decks
27%synergy
Enchantments
Frostcliff Siege
50%inclusion1 decks2 decks
47%synergy
Black Market Connections
33%inclusion1 decks3 decks
22%synergy
Mystic Remora
33%inclusion1 decks3 decks
18%synergy
Phyrexian Arena
33%inclusion1 decks3 decks
23%synergy
Rhystic Study
33%inclusion1 decks3 decks
10%synergy
Unstoppable Plan
33%inclusion1 decks3 decks
32%synergy
Candlekeep Sage
33%inclusion1 decks3 decks
33%synergy
Propaganda
33%inclusion1 decks3 decks
20%synergy
Rising of the Day
33%inclusion1 decks3 decks
30%synergy
Unfulfilled Desires
33%inclusion1 decks3 decks
33%synergy
Training Grounds
33%inclusion1 decks3 decks
33%synergy
Planeswalkers
Daretti, Scrap Savant
33%inclusion1 decks3 decks
32%synergy
Utility Lands
Riptide Laboratory
100%inclusion3 decks3 decks
96%synergy
Command Beacon
67%inclusion2 decks3 decks
62%synergy
Minamo, School at Water's Edge
67%inclusion2 decks3 decks
64%synergy
Sanctum of Eternity
67%inclusion2 decks3 decks
66%synergy
Arena of Glory
33%inclusion1 decks3 decks
28%synergy
Sunken Palace
33%inclusion1 decks3 decks
33%synergy
Urborg, Tomb of Yawgmoth
33%inclusion1 decks3 decks
19%synergy
Bojuka Bog
33%inclusion1 decks3 decks
9%synergy
Great Furnace
33%inclusion1 decks3 decks
28%synergy
Hall of the Bandit Lord
33%inclusion1 decks3 decks
33%synergy
Seat of the Synod
33%inclusion1 decks3 decks
28%synergy
Vault of Whispers
33%inclusion1 decks3 decks
28%synergy
Mana Artifacts
Arcane Signet
100%inclusion3 decks3 decks
12%synergy
Gilded Lotus
100%inclusion3 decks3 decks
97%synergy
Sol Ring
100%inclusion3 decks3 decks
10%synergy
Dimir Signet
33%inclusion1 decks3 decks
-3%synergy
Fellwar Stone
33%inclusion1 decks3 decks
-2%synergy
Izzet Signet
33%inclusion1 decks3 decks
0%synergy
Talisman of Creativity
33%inclusion1 decks3 decks
-11%synergy
Basalt Monolith
33%inclusion1 decks3 decks
31%synergy
Coveted Jewel
33%inclusion1 decks3 decks
32%synergy
Khalni Gem
33%inclusion1 decks3 decks
33%synergy
Talisman of Dominance
33%inclusion1 decks3 decks
-16%synergy
Patriar's Seal
33%inclusion1 decks3 decks
33%synergy
Lands
Command Tower
100%inclusion3 decks3 decks
8%synergy
Shipwreck Marsh
100%inclusion3 decks3 decks
75%synergy
Shivan Reef
100%inclusion3 decks3 decks
71%synergy
Sulfurous Springs
100%inclusion3 decks3 decks
73%synergy
Underground River
100%inclusion3 decks3 decks
73%synergy
Exotic Orchard
67%inclusion2 decks3 decks
10%synergy
Haunted Ridge
67%inclusion2 decks3 decks
45%synergy
Stormcarved Coast
67%inclusion2 decks3 decks
41%synergy
Xander's Lounge
67%inclusion2 decks3 decks
26%synergy
Dragonskull Summit
67%inclusion2 decks3 decks
22%synergy
Drowned Catacomb
67%inclusion2 decks3 decks
24%synergy
Sulfur Falls
67%inclusion2 decks3 decks
21%synergy
Blood Crypt
33%inclusion1 decks3 decks
-11%synergy
Bloodstained Mire
33%inclusion1 decks3 decks
-1%synergy
Luxury Suite
33%inclusion1 decks3 decks
2%synergy
Morphic Pool
33%inclusion1 decks3 decks
1%synergy
Polluted Delta
33%inclusion1 decks3 decks
-1%synergy
Raucous Theater
33%inclusion1 decks3 decks
23%synergy
Scalding Tarn
33%inclusion1 decks3 decks
1%synergy
Steam Vents
33%inclusion1 decks3 decks
-11%synergy
Thundering Falls
33%inclusion1 decks3 decks
23%synergy
Training Center
33%inclusion1 decks3 decks
1%synergy
Undercity Sewers
33%inclusion1 decks3 decks
21%synergy
Watery Grave
33%inclusion1 decks3 decks
-14%synergy
Seething Landscape
33%inclusion1 decks3 decks
16%synergy
Smoldering Marsh
33%inclusion1 decks3 decks
-4%synergy
Sunken Hollow
33%inclusion1 decks3 decks
-7%synergy
Crumbling Necropolis
33%inclusion1 decks3 decks
-21%synergy