Gnokius, Skeleton Lord

Menace, dread (Whenever one or more cards are put into an opponent's graveyard from anywhere, this creature gets +1/+1 until end of turn.)
Whenever a non-Skeleton creature you control dies, you may exile that card. If you do, create a 1/1 black Skeleton creature token with dread and
"{1}, Sacrifice this creature: Target creature gets
-X/-X until end of turn, where X is this creature's power."