Abyssal Specter

Flying
Whenever this creature deals damage to a player, that player discards a card.

Severed Legion

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

Terror

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

Crowd of Cinders

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
Crowd of Cinders's power and toughness are each equal to the number of black permanents you control.

Underworld Dreams

Whenever an opponent draws a card, this enchantment deals 1 damage to that player.

Ravenous Rats

When this creature enters, target opponent discards a card.

Mind Rot

Sengir Vampire

Flying (This creature can't be blocked except by creatures with flying or reach.)
Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature.

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.)

Demon's Horn

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

Swamp

Ascendant Evincar

Flying (This creature can't be blocked except by creatures with flying or reach.)
Other black creatures get +1/+1.
Nonblack creatures get -1/-1.

The Rack

As this artifact enters, choose an opponent.
At the beginning of the chosen player's upkeep, this artifact deals X damage to that player, where X is 3 minus the number of cards in their hand.

Consume Spirit

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

Megrim

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

Mind Shatter

Target player discards X cards at random.

Unholy Strength

Enchant creature
Enchanted creature gets +2/+1.

Mortivore

Mortivore's power and toughness are each equal to the number of creature cards in all graveyards.
{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.)