You can't win the game and your opponents can't lose the game.
6 /
6
{3}{B}
Ambition's Cost
Sorcery
You draw three cards and you lose 3 life.
{B}
Blood Pet
Creature - Thrull
Sacrifice Blood Pet: Add {B}.
1 /
1
--
Cabal Coffers
Land
{2}, {T}: Add {B} for each Swamp you control.
--
Cabal Stronghold
Land
{T}: Add {C}.
{3}, {T}: Add {B} for each basic Swamp you control.
{B}
Carrion Feeder
Creature - Zombie
Carrion Feeder can't block.
Sacrifice a creature: Put a +1/+1 counter on Carrion Feeder.
1 /
1
--
Castle Locthwain
Land
Castle Locthwain enters the battlefield tapped unless you control a Swamp.
{T}: Add {B}.
{1}{B}{B}, {T}: Draw a card, then you lose life equal to the number of cards in your hand.
{3}{B}
Crypt Ghast
Creature - Spirit
Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)
Whenever you tap a Swamp for mana, add an additional {B}.
2 /
2
{2}{B}
Curse of the Restless Dead
Enchantment - Aura Curse
Enchant player
Whenever a land enters the battlefield under enchanted player's control, you create a 2/2 black Zombie creature token with decayed. (It can't block. When it attacks, sacrifice it at end of combat.)
{B}
Dark Ritual
Instant
Add {B}{B}{B}.
{B}
Defile
Instant
Target creature gets -1/-1 until end of turn for each Swamp you control.
{2}{B}{B}
Desecration Demon
Creature - Demon
Flying
At the beginning of each combat, any opponent may sacrifice a creature. If a player does, tap Desecration Demon and put a +1/+1 counter on it.
6 /
6
{3}{B}{B}
Dictate of Erebos
Enchantment
Flash
Whenever a creature you control dies, each opponent sacrifices a creature.
{2}{B}{B}
Drag to the Underworld
Instant
This spell costs {X} less to cast, where X is your devotion to black. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)
Destroy target creature.
{2}{B}{B}
Dread Return
Sorcery
Return target creature card from your graveyard to the battlefield.
Flashback--Sacrifice three creatures. (You may cast this card from your graveyard for its flashback cost. Then exile it.)
{3}{B}
Dredge the Mire
Sorcery
Each opponent chooses a creature card in their graveyard. Put those cards onto the battlefield under your control.
{4}{B}{B}
Endless Obedience
Sorcery
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Put target creature card from a graveyard onto the battlefield under your control.
{4}{B}{B}
Feast of Succession
Sorcery
All creatures get -4/-4 until end of turn. You become the monarch.
{1}{B}
Feed the Swarm
Sorcery
Destroy target creature or enchantment an opponent controls. You lose life equal to that permanent's mana value.
{2}{B}
Fell Stinger
Creature - Zombie Scorpion
Deathtouch
Exploit (When this creature enters the battlefield, you may sacrifice a creature.)
When Fell Stinger exploits a creature, target player draws two cards and loses 2 life.
3 /
2
{4}{B}{B}
Geth, Lord of the Vault
Legendary Creature - Phyrexian Zombie
Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)
{X}{B}: Put target artifact or creature card with mana value X from an opponent's graveyard onto the battlefield under your control tapped. Then that player mills X cards.
5 /
5
{3}{B}{B}
Ghoulcaller Gisa
Legendary Creature - Human Wizard
{B}, {T}, Sacrifice another creature: Create X 2/2 black Zombie creature tokens, where X is the sacrificed creature's power.
3 /
4
{4}{B}
Gift of Doom
Enchantment - Aura
Enchant creature
Enchanted creature has deathtouch and indestructible.
Morph--Sacrifice another creature. (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
As Gift of Doom is turned face up, you may attach it to a creature.
{3}{B}{B}
Gray Merchant of Asphodel
Creature - Zombie
When Gray Merchant of Asphodel enters the battlefield, each opponent loses X life, where X is your devotion to black. You gain life equal to the life lost this way. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)
2 /
4
{2}{B}
Grim Haruspex
Creature - Human Wizard
Morph {B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
Whenever another nontoken creature you control dies, draw a card.
3 /
2
{2}{B}{B}
Hagra Mauling
Instant
This spell costs {1} less to cast if an opponent controls no basic lands.
Destroy target creature.
--
Hagra Broodpit
Land
Hagra Broodpit enters the battlefield tapped.
{T}: Add {B}.
{4}
Hedron Archive
Artifact
{T}: Add {C}{C}.
{2}, {T}, Sacrifice Hedron Archive: Draw two cards.
{4}{B}{B}
Hex
Sorcery
Destroy six target creatures.
--
Hive of the Eye Tyrant
Land
If you control two or more other lands, Hive of the Eye Tyrant enters the battlefield tapped.
{T}: Add {B}.
{3}{B}: Until end of turn, Hive of the Eye Tyrant becomes a 3/3 black Beholder creature with menace and "Whenever this creature attacks, exile target card from defending player's graveyard." It's still a land.
{7}{B}{B}
In Garruk's Wake
Sorcery
Destroy all creatures you don't control and all planeswalkers you don't control.
{2}
Leaden Myr
Artifact Creature - Myr
{T}: Add {B}.
1 /
1
{2}{B}
Liliana's Devotee
Creature - Human Warlock
Zombies you control get +1/+0.
At the beginning of your end step, if a creature died this turn, you may pay {1}{B}. If you do, create a 2/2 black Zombie creature token.
2 /
3
{2}
Liquimetal Torque
Artifact
{T}: Add {C}.
{T}: Target nonland permanent becomes an artifact in addition to its other types until end of turn.
{3}{B}{B}
Living Death
Sorcery
Each player exiles all creature cards from their graveyard, then sacrifices all creatures they control, then puts all cards they exiled this way onto the battlefield.
{B}
Malakir Rebirth
Instant
Choose target creature. You lose 2 life. Until end of turn, that creature gains "When this creature dies, return it to the battlefield tapped under its owner's control."
--
Malakir Mire
Land
Malakir Mire enters the battlefield tapped.
{T}: Add {B}.
{2}{B}
Midnight Reaper
Creature - Zombie Knight
Whenever a nontoken creature you control dies, Midnight Reaper deals 1 damage to you and you draw a card.
3 /
2
{2}
Mind Stone
Artifact
{T}: Add {C}.
{1}, {T}, Sacrifice Mind Stone: Draw a card.
{2}{B}
Morbid Opportunist
Creature - Human Rogue
Whenever one or more other creatures die, draw a card. This ability triggers only once each turn.
1 /
3
{2}{B}
Nantuko Husk
Creature - Zombie Insect
Sacrifice a creature: Nantuko Husk gets +2/+2 until end of turn.
2 /
2
{1}{B}{B}
Necroplasm
Creature - Ooze
At the beginning of your upkeep, put a +1/+1 counter on Necroplasm.
At the beginning of your end step, destroy each creature with mana value equal to the number of +1/+1 counters on Necroplasm.
Dredge 2 (If you would draw a card, you may mill two cards instead. If you do, return this card from your graveyard to your hand.)
1 /
1
{4}
Nevinyrral's Disk
Artifact
Nevinyrral's Disk enters the battlefield tapped.
{1}, {T}: Destroy all artifacts, creatures, and enchantments.
{1}{B}{B}
Nighthowler
Enchantment Creature - Horror
Bestow {2}{B}{B} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)
Nighthowler and enchanted creature each get +X/+X, where X is the number of creature cards in all graveyards.
0 /
0
{1}{B}{B}
Pact of the Serpent
Sorcery
Choose a creature type. Target player draws X cards and loses X life, where X is the number of creatures they control of the chosen type.
{3}{B}
Paragon of Open Graves
Creature - Skeleton Warrior
Other black creatures you control get +1/+1.
{2}{B}, {T}: Another target black creature you control gains deathtouch until end of turn. (Any amount of damage it deals to a creature is enough to destroy it.)
2 /
2
{B}{B}{B}
Phylactery Lich
Creature - Zombie
Indestructible
As Phylactery Lich enters the battlefield, put a phylactery counter on an artifact you control.
When you control no permanents with phylactery counters on them, sacrifice Phylactery Lich.
5 /
5
{3}{B}{B}
Phyrexian Delver
Creature - Phyrexian Zombie
When Phyrexian Delver enters the battlefield, return target creature card from your graveyard to the battlefield. You lose life equal to that card's mana value.
3 /
2
{3}
Phyrexian Soulgorger
Snow Artifact Creature - Phyrexian Construct
Cumulative upkeep--Sacrifice a creature. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
8 /
8
{7}{B}{B}
Plague Wind
Sorcery
Destroy all creatures you don't control. They can't be regenerated.
{2}{B}
Read the Bones
Sorcery
Scry 2, then draw two cards. You lose 2 life.
{3}
Relic Golem
Artifact Creature - Golem
Relic Golem can't attack or block unless an opponent has eight or more cards in their graveyard.
{2}, {T}: Target player mills two cards. (They put the top two cards of their library into their graveyard.)
6 /
6
--
Scavenger Grounds
Land - Desert
{T}: Add {C}.
{2}, {T}, Sacrifice a Desert: Exile all graveyards.
{3}{B}{B}
Sidisi, Undead Vizier
Legendary Creature - Zombie Naga
Deathtouch
Exploit (When this creature enters the battlefield, you may sacrifice a creature.)
When Sidisi, Undead Vizier exploits a creature, you may search your library for a card, put it into your hand, then shuffle.
4 /
6
{B}{B}
Sign in Blood
Sorcery
Target player draws two cards and loses 2 life.
{X}{B}
Skeletal Scrying
Instant
As an additional cost to cast this spell, exile X cards from your graveyard.
You draw X cards and you lose X life.
{3}{B}
Snuff Out
Instant
If you control a Swamp, you may pay 4 life rather than pay this spell's mana cost.
Destroy target nonblack creature. It can't be regenerated.
{1}
Sol Ring
Artifact
{T}: Add {C}{C}.
{1}{B}
Soldevi Adnate
Creature - Human Cleric
{T}, Sacrifice a black or artifact creature: Add an amount of {B} equal to the sacrificed creature's mana value.
1 /
2
{2}{B}{B}
Spawn of Mayhem
Creature - Demon
Spectacle {1}{B}{B} (You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn.)
Flying, trample
At the beginning of your upkeep, Spawn of Mayhem deals 1 damage to each player. Then if you have 10 or less life, put a +1/+1 counter on Spawn of Mayhem.
4 /
4
{2}{B}{B}
Squelching Leeches
Creature - Leech
Squelching Leeches's power and toughness are each equal to the number of Swamps you control.
* /
*
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
{3}{B}
Syphon Mind
Sorcery
Each other player discards a card. You draw a card for each card discarded this way.
{3}{B}
Tendrils of Corruption
Instant
Tendrils of Corruption deals X damage to target creature and you gain X life, where X is the number of Swamps you control.
{3}
Thousand-Year Elixir
Artifact
You may activate abilities of creatures you control as though those creatures had haste.
{1}, {T}: Untap target creature.
{B}{B}
Undead Augur
Creature - Zombie Wizard
Whenever Undead Augur or another Zombie you control dies, you draw a card and you lose 1 life.
2 /
2
{B}
Vampiric Rites
Enchantment
{1}{B}, Sacrifice a creature: You gain 1 life and draw a card.
{3}{B}
Vengeful Dead
Creature - Zombie
Whenever Vengeful Dead or another Zombie dies, each opponent loses 1 life.
3 /
2
{3}{B}
Vindictive Vampire
Creature - Vampire
Whenever another creature you control dies, Vindictive Vampire deals 1 damage to each opponent and you gain 1 life.
2 /
3
{4}{B}
Yargle, Glutton of Urborg
Legendary Creature - Frog Spirit
9 /
3
{1}{B}
Zulaport Cutthroat
Creature - Human Rogue Ally
Whenever Zulaport Cutthroat or another creature you control dies, each opponent loses 1 life and you gain 1 life.