When Abyssal Gatekeeper dies, each player sacrifices a creature.

Flying

When Abyssal Horror enters the battlefield, target player discards two cards.

Whenever an opponent discards a card, Abyssal Nocturnus gets +2/+2 and gains fear until end of turn. (It can't be blocked except by artifact creatures and/or black creatures.)

At the beginning of each player's upkeep, that player discards a card at random.

At the beginning of your upkeep, sacrifice Breeding Pit unless you pay {B}{B}.

At the beginning of your end step, create a 0/1 black Thrull creature token.

Destroy target nonartifact attacking creature. It can't be regenerated. Create a black Spirit creature token. Its power is equal to that creature's power and its toughness is equal to that creature's toughness. Sacrifice the token at the beginning of the next end step.

As an additional cost to cast this spell, sacrifice a creature.

Create X 0/1 black Insect creature tokens, where X is the sacrificed creature's power.

Target player discards two cards. That player may copy this spell and may choose a new target for that copy.

If a player would draw a card except the first one they draw in each of their draw steps, that player discards a card instead. If the player discards a card this way, they draw a card. If the player doesn't discard a card this way, they mill a card.

Flying

Threshold -- As long as seven or more cards are in your graveyard, Childhood Horror gets +2/+2 and can't block.

Enchant creature you control

Whenever enchanted creature attacks and isn't blocked, you may have it assign no combat damage this turn. If you do, defending player discards a card at random.

{1}{B}, Exile one or more creature cards from your graveyard: Create a tapped X/X black Zombie Horror creature token, where X is twice the number of cards exiled this way.

{B}, Sacrifice a creature: Regenerate Corrupted Harvester.

Crypt of Agadeem enters the battlefield tapped.

{T}: Add {B}.

{2}, {T}: Add {B} for each black creature card in your graveyard.

Enchant player

Whenever a player attacks enchanted player with one or more creatures, that attacking player may create a tapped 2/2 black Zombie creature token.

Each player discards three cards.

Flying, trample

At the beginning of your upkeep, sacrifice a creature.

Sacrifice a creature: Regenerate Devouring Strossus.

At the beginning of your upkeep, you may put a verse counter on Discordant Dirge.

{B}, Sacrifice Discordant Dirge: Look at target opponent's hand and choose up to X cards from it, where X is the number of verse counters on Discordant Dirge. That player discards those cards.

Each player mills X cards. For each creature card put into a graveyard this way, you create a tapped 2/2 black Zombie creature token.

Drinker of Sorrow can't block.

Whenever Drinker of Sorrow deals combat damage, sacrifice a permanent.

Protection from white

At the beginning of your end step, you lose 4 life.

Whenever a creature dies, you gain 2 life.

Target player discards two cards. Scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Transfigure {1}{B}{B} ({1}{B}{B}, Sacrifice this creature: Search your library for a creature card with the same mana value as this creature, put that card onto the battlefield, then shuffle. Transfigure only as a sorcery.)

Target player discards three cards.

Sacrifice Fume Spitter: Put a -1/-1 counter on target creature.

{X}{B}, {T}, Discard two cards: Target player discards X cards at random.

Grim Strider gets -1/-1 for each card in your hand.

Target player discards two cards.

Morbid -- If a creature died this turn, instead that player reveals their hand, you choose two cards from it, then that player discards those cards.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Whenever Guiltfeeder attacks and isn't blocked, defending player loses 1 life for each card in their graveyard.

Target player discards two cards. If you cast this spell during your main phase, that player discards four cards instead.

{T}, Sacrifice a creature: Return target creature card from your graveyard to the battlefield. Activate only during your upkeep.

When Hidden Horror enters the battlefield, sacrifice it unless you discard a creature card.

Whenever you cycle or discard another card, Horror of the Broken Lands gets +2/+1 until end of turn.

Cycling {B} ({B}, Discard this card: Draw a card.)

Target player discards two cards at random.

When Laquatus's Champion enters the battlefield, target player loses 6 life.

When Laquatus's Champion leaves the battlefield, that player gains 6 life.

{B}: Regenerate Laquatus's Champion.

Whenever a creature you control deals combat damage to a player, that player discards a card.

Whenever an opponent discards a card, that player loses 2 life.

Whenever an opponent discards a card, Megrim deals 2 damage to that player.

Target player discards two cards and loses 2 life.

Exile X target creature cards from your graveyard. For each creature card exiled this way, create a 2/2 black Zombie creature token.

Target opponent discards a card at random.

Target player discards two cards.

Target player discards X cards at random.

{B}, Sacrifice a creature: Target opponent reveals their hand. You choose a card from it. That player discards that card. Activate only as a sorcery.

Target player discards a card for each Swamp you control.

When Mindslicer dies, each player discards their hand.

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.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Suspend 7--{1}{B} (Rather than cast this card from your hand, you may pay {1}{B} and exile it with seven time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost. It has haste.)

Whenever a card is put into an opponent's graveyard from anywhere, if Nihilith is suspended, you may remove a time counter from Nihilith.

When you cast this spell, any player may discard three cards. If a player does, counter Phantasmagorian.

Discard three cards: Return Phantasmagorian from your graveyard to your hand.

Trample

Whenever a source deals damage to Phyrexian Obliterator, that source's controller sacrifices that many permanents.

{B}: Primeval Shambler gets +1/+1 until end of turn.

Whenever a creature dies, you may put a quest counter on Quest for the Gravelord.

Remove three quest counters from Quest for the Gravelord and sacrifice it: Create a 5/5 black Zombie Giant creature token.

Whenever an opponent discards a card, you may put a quest counter on Quest for the Nihil Stone.

At the beginning of each opponent's upkeep, if that player has no cards in hand and Quest for the Nihil Stone has two or more quest counters on it, you may have that player lose 5 life.

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

Whenever a source deals damage to Reaper of Sheoldred, that source's controller gets a poison counter.

As Sewer Nemesis enters the battlefield, choose a player.

Sewer Nemesis's power and toughness are each equal to the number of cards in the chosen player's graveyard.

Whenever the chosen player casts a spell, that player mills a card.

When you cast a creature spell, sacrifice Skittering Horror.

When you cast a creature spell, sacrifice Skittering Monstrosity.

When Slum Reaper enters the battlefield, each player sacrifices a creature.

Create an X/X black Horror creature token, where X is the number of creatures that died this turn.

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Trample

When Thought Gorger enters the battlefield, put a +1/+1 counter on it for each card in your hand. If you do, discard your hand.

When Thought Gorger leaves the battlefield, draw a card for each +1/+1 counter on it.

{B}, Sacrifice Urborg Mindsucker: Target opponent discards a card at random. Activate only as a sorcery.

At the beginning of each player's upkeep, if that player controls a nonblack, nonland permanent, Urborg Stalker deals 1 damage to that player.

Trample

If another creature would die, exile it instead.

Put a card exiled with Void Maw into its owner's graveyard: Void Maw gets +2/+2 until end of turn.

Whenever an opponent discards a creature card, create a 2/2 black Zombie creature token.

Whenever an opponent discards a land card, add {B}{B}.

Whenever an opponent discards a noncreature, nonland card, draw a card.