Den Protector

Creatures with power less than Den Protector's power can't block it.
Megamorph 1Green (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.