Tirita, Masked Kitsune

Morph {u}{b} (You may cast this card face-down as
a 2/2 creature for {3}. Turn it face-up at any time for
its Morph cost.)
Whenever you cast a face-down creature spell,
target face-down creature gets +2+2 until end of
turn.
{u}{b}, {t}, Turn a creature you control face-up:
Target player puts the top five cards of their
library into their graveyard.