Keeper of the Catacombs

Morph {b}{b} (You may cast this creature face down
as a 2/2 creature for {3}. Turn it face up anytime for its morph cost.)
When Keeper of the Catacombs is turned face up, you may sacrifice a creature. If you do, destroy target attacking creature an opponent controls.
Whenever a creature dies, create a skull artifact with, "{t}, Sacrifice this artifact: Scry 1."