Mortuary
Gray Merchant of Asphodel
Bolas's Citadel
Yahenni, Undying Partisan

   Prerequisites

What do I need to start this combo?
Gray Merchant of Asphodel in hand or in your library (Gray Merchant of Asphodel on top of your library in your library).
All other permanents on the battlefield.
Your life total is at least 6 if Gray Merchant is on the top of your library, or you have 3 available otherwise.

   Steps

How does this combo work?
1
Cast Gray Merchant either from your hand by paying 3 or from the top of your library by paying 5 life.
2
When Gray Merchant enters, it triggers, causing each opponent to lose life equal to your devotion to black and causing you to gain life equal to the life lost this way.
3
Activate Yahenni by sacrificing Gray Merchant.
4
When Gray Merchant dies, Mortuary triggers, putting Gray Merchant from your graveyard onto the top of your library.
5
Resolve the Yahenni ability.
6
Repeat.

   Results

What do I get from this combo?
Infinite LTB
Infinite ETB
Infinite sacrifice triggers
Infinite death triggers
Infinite lifegain triggers
Infinite lifegain
Infinite lifeloss
Sephiroth, Fabled SOLDIER
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K'rrik, Son of Yawgmoth
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Korvold, Fae-Cursed King
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Kokusho, the Evening Star
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Glarb, Calamity's Augur
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High Synergy Cards
Blood Artist
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54%synergy
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52%synergy
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49%synergy
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Top Cards
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45%synergy
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Ophiomancer
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32%synergy
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40%synergy
Accursed Marauder
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Game Changers
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Creatures
Llanowar Elves
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54%synergy
Umbral Collar Zealot
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38%synergy
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31%synergy
Pawn of Ulamog
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Blood Pet
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Fleshbag Marauder
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28%synergy
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26%synergy
Mikaeus, the Unhallowed
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27%synergy
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22%synergy
Lord Skitter, Sewer King
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24%synergy
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16%synergy
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Zodiark, Umbral God
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19%synergy
Fumulus, the Infestation
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18%synergy
Death Cultist
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18%synergy
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16%synergy
Jadar, Ghoulcaller of Nephalia
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Solemn Simulacrum
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Super Shredder
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Grim Haruspex
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12%synergy
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11%synergy
Vincent Valentine
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Stridehangar Automaton
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Gisa, the Hellraiser
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Sifter of Skulls
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12%synergy
Endrek Sahr, Master Breeder
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12%synergy
Nether Traitor
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12%synergy
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12%synergy
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11%synergy
Dark Confidant
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11%synergy
Massacre Wurm
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8%synergy
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10%synergy
Grim Servant
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10%synergy
Instants
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39%synergy
Fell the Profane
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28%synergy
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29%synergy
Sheoldred's Edict
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18%synergy
Entomb
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17%synergy
Infernal Grasp
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Deadly Dispute
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Deadly Rollick
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Supernatural Stamina
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Defile
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Undying Evil
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Consuming Corruption
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Tragic Slip
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Murder
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4%synergy
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Go for the Throat
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Sorceries
Diabolic Intent
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Toxic Deluge
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Exsanguinate
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27%synergy
Sign in Blood
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26%synergy
Victimize
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22%synergy
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Agadeem's Awakening
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Night's Whisper
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Diabolic Tutor
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Damnation
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Doomsday
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Grim Tutor
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Temporal Extortion
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Tendrils of Agony
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Final Act
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Dread Return
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Living Death
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Will of the Abzan
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Repay in Kind
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Beseech the Queen
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Bubbling Muck
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Lively Dirge
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Insatiable Avarice
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Syphon Mind
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5%synergy
Unearth
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Utility Artifacts
Bontu's Monument
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37%synergy
Sensei's Divining Top
34%inclusion13 decks38 decks
30%synergy
Lightning Greaves
29%inclusion11 decks38 decks
4%synergy
Aetherflux Reservoir
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21%synergy
Altar of Dementia
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14%synergy
The Darkness Crystal
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11%synergy
The Masamune
11%inclusion4 decks36 decks
11%synergy
Blasting Station
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10%synergy
Expedition Map
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8%synergy
Swiftfoot Boots
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-16%synergy
Prism Ring
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8%synergy
Demon's Horn
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8%synergy
Agatha's Soul Cauldron
7.9%inclusion3 decks38 decks
7%synergy
Basilisk Collar
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4%synergy
Wishclaw Talisman
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3%synergy
Enchantments
Bastion of Remembrance
37%inclusion14 decks38 decks
30%synergy
Grave Pact
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30%synergy
Black Market Connections
34%inclusion13 decks38 decks
22%synergy
Phyrexian Arena
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17%synergy
Black Market
29%inclusion11 decks38 decks
25%synergy
Bitterblossom
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25%synergy
The Meathook Massacre
26%inclusion10 decks38 decks
21%synergy
Exquisite Blood
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13%synergy
Biotransference
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15%synergy
Dictate of Erebos
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13%synergy
Sanguine Bond
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11%synergy
Font of Agonies
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13%synergy
Nest of Scarabs
13%inclusion5 decks38 decks
12%synergy
Greed
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12%synergy
Animate Dead
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4%synergy
Tombstone Stairwell
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10%synergy
Case of the Stashed Skeleton
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10%synergy
Open the Graves
11%inclusion4 decks38 decks
10%synergy
Chthonian Nightmare
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9%synergy
Oversold Cemetery
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9%synergy
Thran Vigil
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7%synergy
Attrition
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7%synergy
Funeral Room // Awakening Hall
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6%synergy
No Mercy
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6%synergy
Revel in Riches
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5%synergy
Phyrexian Reclamation
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5%synergy
Kaya's Ghostform
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4%synergy
Planeswalkers
Liliana, Dreadhorde General
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12%synergy
Tevesh Szat, Doom of Fools
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10%synergy
Artifacts
Sol Ring
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1%synergy
Arcane Signet
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-27%synergy
Bontu's Monument
39%inclusion15 decks38 decks
37%synergy
Sensei's Divining Top
34%inclusion13 decks38 decks
30%synergy
The Soul Stone
32%inclusion11 decks34 decks
28%synergy
Lightning Greaves
29%inclusion11 decks38 decks
4%synergy
Aetherflux Reservoir
24%inclusion9 decks38 decks
21%synergy
Thought Vessel
24%inclusion9 decks38 decks
7%synergy
Charcoal Diamond
21%inclusion8 decks38 decks
17%synergy
Altar of Dementia
16%inclusion6 decks38 decks
14%synergy
The Darkness Crystal
14%inclusion5 decks36 decks
11%synergy
Mind Stone
13%inclusion5 decks38 decks
-1%synergy
The Masamune
11%inclusion4 decks36 decks
11%synergy
Blasting Station
11%inclusion4 decks38 decks
10%synergy
Expedition Map
11%inclusion4 decks38 decks
8%synergy
Mox Amber
11%inclusion4 decks38 decks
6%synergy
Commander's Sphere
11%inclusion4 decks38 decks
-0%synergy
Swiftfoot Boots
11%inclusion4 decks38 decks
-16%synergy
Prism Ring
7.9%inclusion3 decks38 decks
8%synergy
Demon's Horn
7.9%inclusion3 decks38 decks
8%synergy
Extraplanar Lens
7.9%inclusion3 decks38 decks
7%synergy
Agatha's Soul Cauldron
7.9%inclusion3 decks38 decks
7%synergy
Basilisk Collar
7.9%inclusion3 decks38 decks
4%synergy
Wishclaw Talisman
7.9%inclusion3 decks38 decks
3%synergy
Mana Vault
7.9%inclusion3 decks38 decks
2%synergy
Chrome Mox
7.9%inclusion3 decks38 decks
2%synergy
Fellwar Stone
7.9%inclusion3 decks38 decks
-12%synergy
Utility Lands
Cabal Coffers
58%inclusion22 decks38 decks
49%synergy
Phyrexian Tower
50%inclusion19 decks38 decks
41%synergy
Bojuka Bog
50%inclusion19 decks38 decks
20%synergy
Urborg, Tomb of Yawgmoth
47%inclusion18 decks38 decks
39%synergy
Nykthos, Shrine to Nyx
34%inclusion13 decks38 decks
29%synergy
High Market
29%inclusion11 decks38 decks
26%synergy
Reliquary Tower
26%inclusion10 decks38 decks
-3%synergy
Shizo, Death's Storehouse
24%inclusion9 decks38 decks
19%synergy
Susur Secundi, Void Altar
22%inclusion8 decks36 decks
20%synergy
Midgar, City of Mako
22%inclusion8 decks36 decks
19%synergy
Lake of the Dead
21%inclusion8 decks38 decks
20%synergy
Deserted Temple
21%inclusion8 decks38 decks
20%synergy
Cabal Stronghold
21%inclusion8 decks38 decks
18%synergy
Spymaster's Vault
18%inclusion7 decks38 decks
16%synergy
Volrath's Stronghold
16%inclusion6 decks38 decks
15%synergy
Barad-dûr
16%inclusion6 decks38 decks
14%synergy
Crypt of Agadeem
16%inclusion6 decks38 decks
14%synergy
Barren Moor
16%inclusion6 decks38 decks
13%synergy
Castle Locthwain
16%inclusion6 decks38 decks
12%synergy
War Room
16%inclusion6 decks38 decks
10%synergy
Takenuma, Abandoned Mire
16%inclusion6 decks38 decks
7%synergy
Karn's Bastion
13%inclusion5 decks38 decks
9%synergy
Command Beacon
13%inclusion5 decks38 decks
8%synergy
Urza's Saga
11%inclusion4 decks38 decks
4%synergy
Ancient Tomb
11%inclusion4 decks38 decks
1%synergy
Radiant Fountain
7.9%inclusion3 decks38 decks
7%synergy
Mortuary Mire
7.9%inclusion3 decks38 decks
4%synergy
Temple of the False God
7.9%inclusion3 decks38 decks
-1%synergy
Mana Artifacts
Sol Ring
84%inclusion32 decks38 decks
1%synergy
Arcane Signet
45%inclusion17 decks38 decks
-27%synergy
The Soul Stone
32%inclusion11 decks34 decks
28%synergy
Thought Vessel
24%inclusion9 decks38 decks
7%synergy
Charcoal Diamond
21%inclusion8 decks38 decks
17%synergy
Mind Stone
13%inclusion5 decks38 decks
-1%synergy
Mox Amber
11%inclusion4 decks38 decks
6%synergy
Commander's Sphere
11%inclusion4 decks38 decks
-0%synergy
Extraplanar Lens
7.9%inclusion3 decks38 decks
7%synergy
Mana Vault
7.9%inclusion3 decks38 decks
2%synergy
Chrome Mox
7.9%inclusion3 decks38 decks
2%synergy
Fellwar Stone
7.9%inclusion3 decks38 decks
-12%synergy
Lands
Myriad Landscape
21%inclusion8 decks38 decks
6%synergy
Urza's Cave
16%inclusion6 decks38 decks
13%synergy
Demolition Field
13%inclusion5 decks38 decks
10%synergy
Command Tower
13%inclusion5 decks38 decks
-61%synergy
Gemstone Caverns
11%inclusion4 decks38 decks
5%synergy
Verdant Catacombs
11%inclusion4 decks38 decks
-0%synergy
Polluted Delta
11%inclusion4 decks38 decks
-2%synergy
Marsh Flats
7.9%inclusion3 decks38 decks
-3%synergy
Bloodstained Mire
7.9%inclusion3 decks38 decks
-3%synergy