Shyft
Ice Age — rare
Creature — Shapeshifter
Shyft rulings:
2008-10-01: Shyft’s ability won’t let you make it colorless. Colorless is not a color.
2008-10-01: The ability’s effect has no duration. Shyft will remain the chosen color or colors until the game ends, it leaves the battlefield, or some other effect (such as the next time its ability resolves) changes its colors.