Hidden Dragonslayer

“Lifelink <br> Megamorph 2W<em> (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.)</em> <br> When Hidden Dragonslayer is turned face up, destroy target creature with power 4 or greater an opponent controls.”