Mox Prism

Dawn {w}{u}{b}{r}{g} ---- {t}: Add to your mana pool one mana of any color that a basic land you control could produce. (For example, if you control a basic Island, add {u} to your mana pool. If you control a basic Swamp and a basic Mountain, add {b} or {r} to your mana pool.)
Instead of metal or stone, its unknown creator assembled it from the frozen light of the five suns.