Crystal, Inhuman Princess

The reward scales on a stat nobody usually cares about: not the mana value of your spells, but how many colors are printed on them. A monocolor burn spell pings one to each opponent; a two-color instant hits for two; a five-color haymaker lands five across the table at once. That single design choice pushes the whole deck toward color density rather than raw cost, and the mana ability answers that push directly by tapping for four different colors of its own. The coherence is quiet but real: the same creature that pays you off for casting rainbow noncreature spells also helps assemble the mana to cast them, so it fills the fixing slot and the finisher slot at the same time, a combination that usually asks for two cards. The Wubrg-minus-black spread it produces is a deliberate constraint that shapes what you play alongside it: this is a Jeskai-plus-green engine wearing a two-color mana cost. And because the damage triggers off the cast rather than combat, the real clock is the reach that accumulates across a full turn of spells, chipping down opponents you never had to attack. The 2/3 flying body is almost incidental; the flying matters less as an attacker than as a reminder that the creature was never meant to win by swinging.