Liliana Vess

+1: Target player discards a card.
−2: Search your library for a card, then shuffle and put that card on top.
−8: Put all creature cards from all graveyards onto the battlefield under your control.

Underworld Dreams

Whenever an opponent draws a card, Underworld Dreams deals 1 damage to that player.

Swamp

Mind Rot

Terror

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

Mind Shatter

Target player discards X cards at random.

Megrim

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

Consume Spirit

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

Severed Legion

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

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

Sengir Vampire

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