What are the abilities of Rattleclaw Mystic?
user
{T}: Add {G}, {U}, or {R}.\nMorph {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.)\nWhen Rattleclaw Mystic is turned face up, add {G}{U}{R}.
assistant