Vapor Snag

Return target creature to its owner's hand. Its controller loses 1 life.

Fellwar Stone

{T}: Add one mana of any color that a land an opponent controls could produce.

Prized Amalgam

Whenever a creature enters, if it entered from your graveyard or you cast it from your graveyard, return this card from your graveyard to the battlefield tapped at the beginning of the next end step.

Murder

Grimgrin, Corpse-Born

Grimgrin enters tapped and doesn't untap during your untap step.
Sacrifice another creature: Untap Grimgrin and put a +1/+1 counter on it.
Whenever Grimgrin attacks, destroy target creature defending player controls, then put a +1/+1 counter on Grimgrin.

Counterspell

Bladestitched Skaab

Returned Phalanx

Defender
{1}{U}: This creature can attack this turn as though it didn't have defender.

Rooftop Storm

You may pay {0} rather than pay the mana cost for Zombie creature spells you cast.

Consider

Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
Draw a card.

Champion of the Perished

Whenever another Zombie you control enters, put a +1/+1 counter on this creature.

Have

Island

Corpulent Corpse

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
Suspend 5—{B} (Rather than cast this card from your hand, you may pay {B} and exile it with five time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost. It has haste.)

Choked Estuary

As this land enters, you may reveal an Island or Swamp card from your hand. If you don't, this land enters tapped.
{T}: Add {U} or {B}.

Headless Rider

Whenever this creature or another nontoken Zombie you control dies, create a 2/2 black Zombie creature token.

Swamp

Diregraf Captain

Deathtouch
Other Zombie creatures you control get +1/+1.
Whenever another Zombie you control dies, target opponent loses 1 life.

Shambling Ghast

When this creature dies, choose one —
• Target creature an opponent controls gets -1/-1 until end of turn.
• Create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Gravecrawler

This creature can't block.
You may cast this card from your graveyard as long as you control a Zombie.

Dimir Signet

Carrion Feeder

This creature can't block.
Sacrifice a creature: Put a +1/+1 counter on this creature.