Shadow Rider

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)

Dark Banishing

Destroy target nonblack creature. It can't be regenerated.

Crypt Rats

{X}: This creature deals X damage to each creature and each player. Spend only black mana on X.

Sewer Rats

{B}, Pay 1 life: This creature gets +1/+0 until end of turn. Activate no more than three times each turn.

Mischievous Poltergeist

Flying
Pay 1 life: Regenerate this creature.

Zombie Scavengers

Exile the top creature card of your graveyard: Regenerate this creature.

Fledgling Djinn

Flying
At the beginning of your upkeep, this creature deals 1 damage to you.

Barrow Ghoul

At the beginning of your upkeep, sacrifice this creature unless you exile the top creature card of your graveyard.

Skulking Ghost

Flying
When this creature becomes the target of a spell or ability, sacrifice it.

Nekrataal

First strike
When this creature enters, destroy target nonartifact, nonblack creature. That creature can't be regenerated.

Fallen Askari

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
This creature can't block.

Infernal Tribute

{2}, Sacrifice a nontoken permanent: Draw a card.

Hidden Horror

When this creature enters, sacrifice it unless you discard a creature card.

Strands of Night

{B}{B}, Pay 2 life, Sacrifice a Swamp: Return target creature card from your graveyard to the battlefield.

Shattered Crypt

Return X target creature cards from your graveyard to your hand. You lose X life.

Necratog

Exile the top creature card of your graveyard: this creature gets +2/+2 until end of turn.

Swamp

Spinning Darkness

You may exile the top three black cards of your graveyard rather than pay this spell's mana cost.
Spinning Darkness deals 3 damage to target nonblack creature. You gain 3 life.

Morinfen

Flying
Cumulative upkeep—Pay 1 life. (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.)

Drain Life

Spend only black mana on X.
Drain Life deals X damage to any target. You gain life equal to the damage dealt, but not more life than the player's life total before the damage was dealt, the planeswalker's loyalty before the damage was dealt, or the creature's toughness.

Necromancy

You may cast this spell as though it had flash. If you cast it any time a sorcery couldn't have been cast, the controller of the permanent it becomes sacrifices it at the beginning of the next cleanup step.
When this enchantment enters, if it's on the battlefield, it becomes an Aura with "enchant creature put onto the battlefield with Necromancy." Put target creature card from a graveyard onto the battlefield under your control and attach this enchantment to it. When this enchantment leaves the battlefield, that creature's controller sacrifices it.

Circling Vultures

Flying
You may discard this card any time you could cast an instant.
At the beginning of your upkeep, sacrifice this creature unless you exile the top creature card of your graveyard.

Buried Alive

Search your library for up to three creature cards, put them into your graveyard, then shuffle.