Gisa's Bidding

Create two 2/2 black Zombie creature tokens.
Madness {2}{B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Throttle

Target creature gets -4/-4 until end of turn.

Lamplighter of Selhoff

When this creature enters, if you control another Zombie, you may draw a card. If you do, discard a card.

Rancid Rats

Skulk (This creature can't be blocked by creatures with greater power.)
Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Stitchwing Skaab

Flying
{1}{U}, Discard two cards: Return this card from your graveyard to the battlefield tapped.

Rottenheart Ghoul

When this creature dies, target player discards a card.

Island

Dead Weight

Enchant creature
Enchanted creature gets -2/-2.

Ghoulsteed

{2}{B}, Discard two cards: Return this card from your graveyard to the battlefield tapped.

From Under the Floorboards

Madness {X}{B}{B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)
Create three tapped 2/2 black Zombie creature tokens and you gain 3 life. If this spell's madness cost was paid, instead create X of those tokens and you gain X life.

Drunau Corpse Trawler

When this creature enters, create a 2/2 black Zombie creature token.
{2}{B}: Target Zombie gains deathtouch until end of turn.

Ever After

Return up to two target creature cards from your graveyard to the battlefield. Each of those creatures is a black Zombie in addition to its other colors and types. Put Ever After on the bottom of its owner's library.

Stitched Mangler

This creature enters tapped.
When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.

Macabre Waltz

Return up to two target creature cards from your graveyard to your hand, then discard a card.

Swamp

Crow of Dark Tidings

Flying
When this creature enters or dies, mill two cards. (Put the top two cards of your library into your graveyard.)