Breakneck Shadowfiend

Whenever Breakneck Shadowfiend is turned face
up, destroy target nonblack creature. Then, put
a number of +1/+1 counters on Breakneck Shadowfiend equal to the power of the destroyed creature.
Morph {2}{b}{b} (You may cast this card face down
as a 2/2 creature for {3}. Turn it face up any time for
its morph cost.)