Tendrils of Corruption

Tendrils of Corruption deals X damage to target creature and you gain X life, where X is the number of Swamps you control.

Wall of Bone

Defender (This creature can't attack.)
{B}: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Child of Night

Assassinate

Nightmare

Flying (This creature can't be blocked except by creatures with flying or reach.)
Nightmare's power and toughness are each equal to the number of Swamps you control.

Royal Assassin

Doom Blade

Megrim

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

Howling Banshee

Flying
When this creature enters, each player loses 3 life.

Dread Warlock

This creature can't be blocked except by black creatures.

Looming Shade

{B}: This creature gets +1/+1 until end of turn.

Bog Wraith

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Gravedigger

When this creature enters, you may return target creature card from your graveyard to your hand.

Vampire Aristocrat

Sacrifice a creature: This creature gets +2/+2 until end of turn.

Zombie Goliath

Acolyte of Xathrid

Drudge Skeletons

{B}: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Rise from the Grave

Put target creature card from a graveyard onto the battlefield under your control. That creature is a black Zombie in addition to its other colors and types.

Unholy Strength

Enchant creature
Enchanted creature gets +2/+1.

Mind Shatter

Target player discards X cards at random.

Disentomb

Return target creature card from your graveyard to your hand.

Sign in Blood

Target player draws two cards and loses 2 life.

Demon's Horn

Whenever a player casts a black spell, you may gain 1 life.

Black Knight

First strike (This creature deals combat damage before creatures without first strike.)
Protection from white (This creature can't be blocked, targeted, dealt damage, or enchanted by anything white.)

Diabolic Tutor

Search your library for a card, put that card into your hand, then shuffle.

Consume Spirit

Spend only black mana on X.
Consume Spirit deals X damage to any target and you gain X life.

Cemetery Reaper

Other Zombie creatures you control get +1/+1.
{2}{B}, {T}: Exile target creature card from a graveyard. Create a 2/2 black Zombie creature token.

Weakness

Enchant creature
Enchanted creature gets -2/-1.

Soul Bleed

Enchant creature
At the beginning of the upkeep of enchanted creature's controller, that player loses 1 life.

Warpath Ghoul

Mind Rot

Duress

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.