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.