Ancient Kavu

Color was a weapon in the era this Kavu shipped into: protection from a color, color-hosers, and spot removal that checked whether a creature was red or green could strand an otherwise fine beater behind the wrong answer. The activated ability is a direct response to that pressure. For two generic mana it sheds its red identity entirely, becoming colorless until end of turn, so protection-from-red walls can no longer stop it from attacking and color-specific removal slides off with no legal target. The body is plain, but the ability is a small piece of self-defense built for exactly that environment: a creature that can refuse to be the color the opponent's answers were tuned against. There is a quieter design lesson here, too, in treating color as a property a creature can manipulate at instant speed rather than a fixed label, an idea that runs through colorless-matters and color-evasion effects elsewhere. The limits are baked in: the trick only dodges effects that read color, and it taxes mana every turn you want it, so the Kavu trades raw stats for the flexibility to keep attacking into a board that should have stopped it.