Keyword: Wither

Wither (This deals damage to creatures in the form of -1/-1 counters.)
At the beginning of your upkeep, put a -1/-1 counter on each nonblack creature.

Wither (This deals damage to creatures in the form of -1/-1 counters.)
Inescapable Brute must be blocked if able.

Wither (This deals damage to creatures in the form of -1/-1 counters.)

Wither (This deals damage to creatures in the form of -1/-1 counters.)
Whenever Slinking Giant blocks or becomes blocked, it gets -3/-0 until end of turn.

Reach (This creature can block creatures with flying.)
Wither (This deals damage to creatures in the form of -1/-1 counters.)

First strike
Wither (This deals damage to creatures in the form of -1/-1 counters.)

Haste
Wither (This deals damage to creatures in the form of -1/-1 counters.)