Enchant creature

Enchanted creature gets -X/-X, where X is the number of creature cards in its controller's graveyard.

Return two target creature cards from your graveyard to your hand.

Whenever a creature you control dies, put X +1/+1 counters on target creature you control, where X is the power of the creature that died.

Flying

When Death's-Head Buzzard dies, all creatures get -1/-1 until end of turn.

Flying, haste

When Echo of Death's Wail enters, gain control of all Rat tokens.

Whenever Echo of Death's Wail attacks, you may sacrifice another creature. If you do, draw a card.

When Kroxa enters, sacrifice it unless it escaped.

Whenever Kroxa enters or attacks, each opponent discards a card, then each opponent who didn't discard a nonland card this way loses 3 life.

Escape—, Exile five other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)

+1: Create a 2/2 black Zombie creature token. Mill two cards.

−3: Return target creature card from your graveyard to the battlefield. That creature is a black Zombie in addition to its other colors and types.

−7: Destroy all non-Zombie creatures.

: Add .

, : Target legendary creature gains fear until end of turn. (It can't be blocked except by artifact creatures and/or black creatures.)