Prismatic Skyserpent

Flying, Vigilance
When Prismatic Skyserpent enters the battlefield, create a copy of it, except its color is chosen at random from the colors of mana
spent to cast it.
Colorshift (As Prismatic Skyserpent enters the battlefield or at the beginning of your upkeep,
you may pay {2}. If you do, it becomes a creature of a random color until end of turn.)
Colorshifted creatures gain "This creature's power and toughness are each equal to the number of different colors of mana
spent to cast it."