Rattleclaw Mystic

{t}: Add {g}, {u}, or {r} to your mana pool.
Morph {2} (You may cast this card face down
as a 2/2 creature for {3}. Turn it face up any
time for its morph cost.)
When Rattleclaw Mystic is turned face up,
add {g}{u}{r} to your mana pool.