Road Dryad

When Road Dryad enters the battlefield or
is turned face up its controller gains life
equal to the total power of creatures they
control.
Megamorph {4}{g}{g} (You may cast this card
face down as a 2/2 creature for {3}. Turn it face
up at any time for its megamorph cost and put a +1/+1 counter on it.)