Finder of the Hidden

Whenever you cast a card face down, put a +1/+1 counter on Finder of the Hidden.
Remove a +1/+1 counter from Finder of the Hidden: Add {1} to your mana pool. Spend that mana only on morph or megamorph costs.
Megamorph {2}{g}{u} (You may cast this card face down for {3}. Turn if face up at any time for its megamorph cost with a +1/+1 counter on it.)