Den Protector

Creatures with power less than Den Protector's
power can't block it.
Megamorph {1}{g} (You may cast this card face
down as a 2/2 creature for {3}. Turn it face up any
time for its megamorph cost and put a +1/+1 counter
on it.)
When Den Protector is turned face up, return
target card from your graveyard to your hand.