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 2/2creature 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.