Shadow Puppeteers
The strangeness here is the second ability, which reads like a category error and is meant to. Faeries are a small-flyer tribe: chip damage, evasion, wide boards of 1/1s. Turning any attacking flyer into a 4/4 red Dragon "in addition to its other colors and types" is a tribal pivot in the middle of combat, converting a swarm of one-power evasive tokens into a squadron of four-power Dragons that keeps whatever else it already was. The base-power-and-toughness setting is the mechanically precise part: it overwrites the token's printed stats to 4/4 rather than adding to them, so a 1/1 Faerie Rogue and a 4/4 body arrive at the same size, which is the point of making the trigger optional. The "in addition" clause is what turns this from a pump spell into something odder, since the creatures stay Faeries while becoming Dragons, keeping every tribal hook you built around them intact. This is a build-around that wants a board already committed to flying: the enters trigger gives you two bodies to start, the ward tax protects the engine, and the Dragon rider rewards attacking wide rather than tall. The design tension it resolves is how to give a go-wide flyers deck a way to close, without printing a finisher that abandons the tribe it was built to support. The Dragons are on loan for a turn; the Faeries are what you keep.

