Necropolis of Azar

Whenever a non-black creature is put into any graveyard from play, put a husk counter on Necropolis of Azar.
{5}, Remove a husk counter from Necropolis of Azar: Put a Spawn of Azar token into play. Treat this token as a black creature with a random power and toughness, each no less than 1 and no greater than 3, that has swampwalk.

Unholy Strength

Enchant creature
Enchanted creature gets +2/+1.

Cosmic Horror

First strike
At the beginning of your upkeep, destroy this creature unless you pay {3}{B}{B}{B}. If this creature is destroyed this way, it deals 7 damage to you.

Animate Dead

Enchant creature card in a graveyard
When this Aura enters, if it's on the battlefield, it loses "enchant creature card in a graveyard" and gains "enchant creature put onto the battlefield with this Aura." Return enchanted creature card to the battlefield under your control and attach this Aura to it. When this Aura leaves the battlefield, that creature's controller sacrifices it.
Enchanted creature gets -1/-0.

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.

Bog Wraith

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

Swamp

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.)

Raise Dead

Return target creature card from your graveyard to your hand.

Scathe Zombies

Lost Soul

Bad Moon

Evil Presence

Dark Ritual

Zombie Master

Other Zombie creatures have swampwalk. (They can't be blocked as long as defending player controls a Swamp.)
Other Zombies have "{B}: Regenerate this permanent."