Painbringer

, : Reveal any number of black cards in your hand. Target creature gets -X/-X until end of turn, where X is the number of cards revealed this way.

Undergrowth — When this creature enters, target creature gains menace and gets +X/+0 until end of turn, where X is the number of creature cards in your graveyard. (It can't be blocked except by two or more creatures.)

Flying

When this creature enters, you may exile one or more creature cards from your graveyard. When you do, each other creature gets -X/-X until end of turn, where X is the number of cards exiled this way.

Specialize

At the beginning of combat on your turn, target creature you control gets +X/+0 until end of turn, where X is the number of creature cards in your graveyard.

Target creature gets -X/-X until end of turn, where X is the number of cards in your graveyard.

This creature enters with X +1/+1 counters on it, where X is the number of creature cards in all graveyards.

, Remove a +1/+1 counter from this creature: Target creature gets -1/-1 until end of turn.