Darting Merfolk

Pay one blue and the body ducks back to hand at instant speed, dodging the removal pointed at it, slipping out of a block before damage, sidestepping any combat math that would have killed it. The pitch is the repeatability: the answer to every threat against this creature is the same activation, and it never gets more expensive. That makes it tedious to attack into and tedious to spend a removal spell on, since the merfolk simply returns to hand the moment you commit. The cost lives in tempo and card economy. Each return pulls the creature off the battlefield for a turn and burns a mana that bought nothing on the table, so the ability defends the body without ever advancing the board: a protection engine that never presses an advantage. It doubles as a late-game mana sink, rescuing the merfolk after a successful attack or yanking it out of a doomed block at the last possible window. Self-bounce stapled to a small frame is a utility chassis blue has revisited many times across its history, and the tension here is plain: the activation guards a 1/1 that does almost nothing once it survives. The protection is real and cheap, but it protects a body that gives you little reason to want it back.