Ephemerate

Rebound is the whole trick here, and it changes what a blink spell is worth. A single white mana buys two enter-the-battlefield triggers across two turns: one now, one at your next upkeep, at no additional cost. That structure quietly upends the usual math on flicker effects, which had always been priced as one-shot value or as combat-step protection. Getting the second flicker for free the following turn turns a modest value spell into an engine that fires twice off a single card. Because it is an instant, the first cast can happen whenever the threat is live, including on an opponent's turn: hold it up to blink a creature out from under targeted removal, since the exile-and-immediate-return resolves the creature back to the battlefield as a fresh object with the pointed spell fizzling, then collect the rebound cast unprompted on your upkeep. Note that the return is immediate, not delayed to the end step, so this dodges spot removal and stack tricks, not sacrifice edicts (the creature is back and legal to be chosen when the edict resolves). The catch that keeps the rebound honest is where the free recast lives: only the second half is locked to your upkeep, so you cannot chain both flickers back to back the way a repeatable outlet could. The effect doubles up on your own clock. Where earlier white flicker spells asked you to pay the mana again each time, this one hands you the repeat and frees that mana the turn you cast it, reframing the ETB payoff as a resource you double rather than a moment you buy once.