Trapjaw Kelpie

Persist creatures usually punish their own value: you get the body twice, but the second copy is smaller, and the archetypes built around them care about the dying, not the creature. Sacrifice loops, enters-the-battlefield triggers, aristocrat drain: persist is fuel, not a finisher. This one inverts the premise by stapling persist to flash. Strip the two keywords and the body is a vanilla 3/3, so the timing is the entire strategic axis. Hold it up during the declare-attackers step and it ambushes at instant speed; trade it in combat or eat a removal spell, and it returns at reduced size to do the same job again. That makes it a blocker an opponent has to answer twice, and the second answer rarely lines up the way the first did, since persist returns the creature the instant the original dies rather than leaving it parked in the graveyard for the controller to rebuy. The flash is what controls when the dying starts: you choose the combat or the bluff, so the trigger fires on a board state you set up rather than one forced on you. And because the colored pips can each be paid with either green or blue mana, the whole self-contained defensive package travels light, slotting into a single-color shell as readily as a two-color one. This is not sacrifice fodder masquerading as a creature; it is the rare persist card that wants to stay on the battlefield.