Have

Pitiless Plunderer

Whenever another creature you control dies, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Swamp

Butcher Ghoul

Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

Geralf's Messenger

This creature enters tapped.
When this creature enters, target opponent loses 2 life.
Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

Accursed Marauder

When this creature enters, each player sacrifices a nontoken creature of their choice.

Final Flourish

Kicker—Sacrifice an artifact or creature. (You may sacrifice an artifact or creature in addition to any other costs as you cast this spell.)
Target creature gets -2/-2 until end of turn. If this spell was kicked, that creature gets -6/-6 until end of turn instead.

Gavony Unhallowed

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

Gravecrawler

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

Don't Have

Headless Rider

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

Nantuko Husk

Sacrifice a creature: This creature gets +2/+2 until end of turn.

Mephitic Draught

When this artifact enters or is put into a graveyard from the battlefield, you draw a card and you lose 1 life.

Costly Plunder

As an additional cost to cast this spell, sacrifice an artifact or creature.
Draw two cards.

Archghoul of Thraben

Whenever this creature or another Zombie you control dies, look at the top card of your library. If it's a Zombie card, you may reveal it and put it into your hand. If you don't put the card into your hand, you may put it into your graveyard.

Maalfeld Twins

When this creature dies, create two 2/2 black Zombie creature tokens.

Undead Augur

Whenever this creature or another Zombie you control dies, you draw a card and you lose 1 life.

Fell

Profane Insight

You draw a card and you lose 1 life. (Then exile this card. You may cast the creature later from exile.)