Fylamarid

A flyer that hunts other flyers, built almost entirely around a single color word. The activated ability paints a target creature blue, which feeds directly into the evasion clause: anything turned blue can no longer block this squid, so a defender that was supposed to trade in the air gets neutered at instant speed for one mana. That is the whole engine, and it is a tidy one. The 1/3 body is a deliberate brake on the design: it survives a lot of incidental damage and pings, but it threatens almost nothing alone, which forces a fresh mana investment every combat just to push a single point of evasive damage through. The color-changing line also reaches sideways into other interactions, since "becomes blue until end of turn" can flip a creature into range of color-specific removal. As a piece of Tempest-era design it reads as an experiment in how much you can wring out of one keyword and one parameter: evasion, defensive disruption, and combat math all routed through the same blue-vs-blue lever, on a creature whose only job is to make the air a worse place to be for everyone else playing the color.