Terrashifting Terrain

When Terrashifting Terrain enters the
battlefield and at the beginning of your
upkeep, choose a kind of color at random that
Terrashifting Terrain doesn't have on it from
among white, blue, black, red, and green.
Terrashifting Terrain gains that color for the
rest of the game.
{t}: Add one mana of one of Terrashifting
Terrain's colors chosen at random.