When Abhorrent Overlord enters the battlefield, create a number of 1/1 black Harpy creature tokens with flying equal to your devotion to black. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)
At the beginning of your upkeep, sacrifice a creature.
6 /
6
{B}
Accursed Centaur
Creature - Zombie Centaur
When Accursed Centaur enters the battlefield, sacrifice a creature.
2 /
2
{1}{B}
Altar's Reap
Instant
As an additional cost to cast this spell, sacrifice a creature.
Draw two cards.
{2}
Arcane Signet
Artifact
{T}: Add one mana of any color in your commander's color identity.
{B}{B}{B}
Ayara, First of Locthwain
Legendary Creature - Elf Noble
Whenever Ayara, First of Locthwain or another black creature enters the battlefield under your control, each opponent loses 1 life and you gain 1 life.
{T}, Sacrifice another black creature: Draw a card.
2 /
3
{2}{B}
Bastion of Remembrance
Enchantment
When Bastion of Remembrance enters the battlefield, create a 1/1 white Human Soldier creature token.
Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life.
{2}
Charcoal Diamond
Artifact
Charcoal Diamond enters the battlefield tapped.
{T}: Add {B}.
{2}
Coldsteel Heart
Snow Artifact
Coldsteel Heart enters the battlefield tapped.
As Coldsteel Heart enters the battlefield, choose a color.
{T}: Add one mana of the chosen color.
{4}
Core Prowler
Artifact Creature - Phyrexian Horror
Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
When Core Prowler dies, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
2 /
2
{B}
Dark Ritual
Instant
Add {B}{B}{B}.
{1}{B}
Deadly Dispute
Instant
As an additional cost to cast this spell, sacrifice an artifact or creature.
Draw two cards and create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")
{2}{B}{B}
Death Pit Offering
Enchantment
When Death Pit Offering enters the battlefield, sacrifice all creatures you control.
Creatures you control get +2/+2.
{2}{B}
Demon's Disciple
Creature - Human Cleric
When Demon's Disciple enters the battlefield, each player sacrifices a creature or planeswalker.
3 /
1
{3}{B}
Disciple of Bolas
Creature - Human Wizard
When Disciple of Bolas enters the battlefield, sacrifice another creature. You gain X life and draw X cards, where X is that creature's power.
2 /
1
{1}{B}
Drekavac
Creature - Beast
When Drekavac enters the battlefield, sacrifice it unless you discard a noncreature card.
3 /
3
{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
{2}
Fellwar Stone
Artifact
{T}: Add one mana of any color that a land an opponent controls could produce.
{2}{B}
Fleshbag Marauder
Creature - Zombie Warrior
When Fleshbag Marauder enters the battlefield, each player sacrifices a creature.
3 /
1
{2}
Fractured Powerstone
Artifact
{T}: Add {C}.
{T}: Roll the planar die. Activate only as a sorcery.
{2}{B}
Grim Affliction
Instant
Put a -1/-1 counter on target creature, then proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
{2}
Leaden Myr
Artifact Creature - Myr
{T}: Add {B}.
1 /
1
{2}{B}
Liliana's Scrounger
Creature - Human Wizard
At the beginning of each end step, if a creature died this turn, you may put a loyalty counter on a Liliana planeswalker you control.
3 /
2
{1}{B}
Liliana's Triumph
Instant
Each opponent sacrifices a creature. If you control a Liliana planeswalker, each opponent also discards a card.
{1}{B}{B}
Liliana, Heretical Healer
Legendary Creature - Human Cleric
Lifelink
Whenever another nontoken creature you control dies, exile Liliana, Heretical Healer, then return her to the battlefield transformed under her owner's control. If you do, create a 2/2 black Zombie creature token.
2 /
3
--
Liliana, Defiant Necromancer
Legendary Planeswalker - Liliana
+2: Each player discards a card.
-X: Return target nonlegendary creature card with mana value X from your graveyard to the battlefield.
-8: You get an emblem with "Whenever a creature dies, return it to the battlefield under your control at the beginning of the next end step."
2 /
3
{3}{B}{B}
Massacre Girl
Legendary Creature - Human Assassin
Menace
When Massacre Girl enters the battlefield, each other creature gets -1/-1 until end of turn. Whenever a creature dies this turn, each creature other than Massacre Girl gets -1/-1 until end of turn.
4 /
4
{3}{B}{B}{B}
Massacre Wurm
Creature - Phyrexian Wurm
When Massacre Wurm enters the battlefield, creatures your opponents control get -2/-2 until end of turn.
Whenever a creature an opponent controls dies, that player loses 2 life.
6 /
5
{2}{B}
Merciless Executioner
Creature - Orc Warrior
When Merciless Executioner enters the battlefield, each player sacrifices a creature.
3 /
1
{2}{B}
Merciless Resolve
Instant
As an additional cost to cast this spell, sacrifice a creature or land.
Draw two cards.
{3}{B}{B}
Ogre Slumlord
Creature - Ogre Rogue
Whenever another nontoken creature dies, you may create a 1/1 black Rat creature token.
Rats you control have deathtouch.
3 /
3
{3}{B}{B}
Open the Graves
Enchantment
Whenever a nontoken creature you control dies, create a 2/2 black Zombie creature token.
{2}
Ornithopter of Paradise
Artifact Creature - Thopter
Flying
{T}: Add one mana of any color.
0 /
2
{1}{B}{B}
Pawn of Ulamog
Creature - Vampire Shaman
Whenever Pawn of Ulamog or another nontoken creature you control dies, you may create a 0/1 colorless Eldrazi Spawn creature token. It has "Sacrifice this creature: Add {C}."
2 /
2
{2}{B}
Plaguecrafter
Creature - Human Shaman
When Plaguecrafter enters the battlefield, each player sacrifices a creature or planeswalker. Each player who can't discards a card.
3 /
2
{1}{B}
Plumb the Forbidden
Instant
As an additional cost to cast this spell, you may sacrifice one or more creatures. When you do, copy this spell for each creature sacrificed this way.
You draw a card and you lose 1 life.
{1}{B}
Priest of Forgotten Gods
Creature - Human Cleric
{T}, Sacrifice two other creatures: Any number of target players each lose 2 life and sacrifice a creature. You add {B}{B} and draw a card.
1 /
2
{1}{B}
Qarsi Sadist
Creature - Human Cleric
Exploit (When this creature enters the battlefield, you may sacrifice a creature.)
When Qarsi Sadist exploits a creature, target opponent loses 2 life and you gain 2 life.
1 /
3
{B}
Sacrifice
Instant
As an additional cost to cast this spell, sacrifice a creature.
Add an amount of {B} equal to the sacrificed creature's mana value.
{2}{B}{B}
Settle the Score
Sorcery
Exile target creature. Put two loyalty counters on a planeswalker you control.
{1}{B}
Skulltap
Sorcery
As an additional cost to cast this spell, sacrifice a creature.
Draw two cards.
{3}{B}
Slum Reaper
Creature - Horror
When Slum Reaper enters the battlefield, each player sacrifices a creature.
4 /
2
{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
{4}{B}
Spread the Sickness
Sorcery
Destroy target creature, then proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
{2}
Star Compass
Artifact
Star Compass enters the battlefield tapped.
{T}: Add one mana of any color that a basic land you control could produce.
--
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}.)
--
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}.)
{B}{B}
The Elderspell
Sorcery
Destroy any number of target planeswalkers. Choose a planeswalker you control. Put two loyalty counters on it for each planeswalker destroyed this way.
{X}{B}{B}
The Meathook Massacre
Legendary Enchantment
When The Meathook Massacre enters the battlefield, each creature gets -X/-X until end of turn.
Whenever a creature you control dies, each opponent loses 1 life.
Whenever a creature an opponent controls dies, you gain 1 life.
{B}
Village Rites
Instant
As an additional cost to cast this spell, sacrifice a creature.
Draw two cards.
{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.