Charcoal Diamond

This artifact enters tapped.
{T}: Add {B}.

Fetid Horror

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

Enfeeblement

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
Enchanted creature gets -2/-2.

Carrion

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.

Infernal Contract

Draw four cards. You lose half your life, rounded up.

Spirit of the Night

Flying, trample, haste, protection from black
Spirit of the Night has first strike as long as it's attacking.

Breathstealer

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

Nocturnal Raid

Black creatures get +2/+0 until end of turn.

Feral Shadow

Dirtwater Wraith

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
{B}: This creature gets +1/+0 until end of turn.

Urborg Panther

{B}, Sacrifice this creature: Destroy target creature blocking it.
Sacrifice a creature named Feral Shadow, a creature named Breathstealer, and this creature: Search your library for a card named Spirit of the Night, put that card onto the battlefield, then shuffle.