Wormfang Drake

Every member of the Wormfang cycle from Judgment carries the same bargain: a body priced well below the curve, paid for by exiling one of your own permanents until it leaves the battlefield. Here the collateral is a creature, and the math is what makes the card a puzzle rather than a liability. Hand it a creature whose enter-the-battlefield trigger you want to re-buy, then bounce or sacrifice the Drake later to flicker that creature home, and the "sacrifice it unless you exile" clause inverts from a tax into an engine. The leave-the-battlefield return is unconditional, so any way to get rid of the Drake (combat death, a sacrifice outlet, even an opponent's removal) hands your exiled creature back, retriggering whatever made it worth exiling. The danger runs the other way too: with no other creature to feed it, the Drake eats itself the moment it lands, and a poorly timed exile can strand a key creature in limbo while your only release valve sits on the battlefield as a 3/4 flier. That tension between blink payoff and self-immolation is the design's whole charge, a flicker tool dressed as a beater that punishes a careless line as readily as it rewards a clever one.