Spectral Slicer

Flying, Phasing, Morph {1} (You may cast this face
down as a 2/2 creature for . Turn it face up any time
for its morph cost.)
Whenever another friendly artifact or creature
becomes the target of a spell you may pay {2}{b} to mill the top cards of you opponents
library equal to the cost of that spell and this
card phases in if it was phased out.