Man-o'-War

The template for the entire bounce-creature lineage. By stapling a Boomerang's worth of tempo onto a 2/2 body, this card established the shape every "enters, return target creature" design has answered to since: undo a blocker and swing in, peel an opposing creature off the board to buy a turn, or reset a board state that has slipped a step out of reach. The 2/2 frame is what bounds the rate; for three mana you receive both a real creature and a free Unsummon stapled to its arrival, which is plenty of value without ever tipping into oppressive. The targeting clause is worth noting for what it does not say: it returns any target creature, including your own, which turns the card into a way to re-trigger your own enters-the-battlefield effects rather than a pure tempo play. It is worth being precise about what bouncing does not do, since the body invites misreading: as a creature cast at sorcery speed, this cannot be deployed in response to anything, and returning a creature to hand does not touch its triggered or activated abilities already sitting on the stack. The bounce is a tempo tool, not an answer to a trigger. That tightly bounded flexibility is why the effect keeps getting reprinted with the numbers tweaked rather than retired. Wizards has circled this exact slot for decades, adjusting the body, the mana, or the rider, but the original Jellyfish remains the clean statement of the idea: a creature that earns its bounce by also being a creature.