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.)

When Festering Mummy dies, you may put a -1/-1 counter on target creature.

When Fleshbag Marauder enters the battlefield, each player sacrifices a creature.

When Ghoulraiser enters the battlefield, return a Zombie card at random from your graveyard to your hand.

{1}, Sacrifice a creature: You gain 2 life.

Afflict 1 (Whenever this creature becomes blocked, defending player loses 1 life.)

Exploit (When this creature enters the battlefield, you may sacrifice a creature.) When Mindleech Ghoul exploits a creature, each opponent exiles a card from their hand.

{T}, Exile three cards from your graveyard: Target player loses 3 life.

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.)

Inspired — Whenever Servant of Tymaret becomes untapped, each opponent loses 1 life. You gain life equal to the life lost this way. {2}{B}: Regenerate Servant of Tymaret.

Tap three untapped creatures you control: Each opponent loses 1 life.

Morph {3}{B}{B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) When Skinthinner is turned face up, destroy target nonblack creature. It can't be regenerated.

When Sultai Emissary dies, manifest the top card of your library. (Put that card onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

When Tattered Mummy dies, each opponent loses 2 life.