Aethermage's Touch

Instant-speed cheating with a built-in lease term. Reveal four, drop a creature in for free, and the cost arrives at your own end step: the creature bounces home, dialing the play back from "free" to "I paid four mana to put a body on the battlefield for one turn at instant speed." That return clause is the whole bargain. It turns the card into a way to fire an enters-the-battlefield trigger, a surprise blocker that vanishes before the opponent can punish it, or a beater that gets one swing and a graveyard-untouched retreat to hand. The randomness is the other tax: you see only the top four, so you are gambling on hitting a creature worth cheating, which pushes the card toward decks dense with high-impact bodies rather than toward a single haymaker you want to find on demand. What sits it slightly outside the usual reanimator-and-Sneak Attack lineage is the color pair and the timing: white-blue does its cheating at instant speed off the top of the library rather than from the graveyard or with a sorcery-speed enabler, so the play is reactive. You hold it up, bluff a counterspell, and convert it into a blocker or a flash threat on the opponent's end step instead of telegraphing a turn-one ritual. The temporary nature keeps the rate honest without an exile clause or a tutored target; the creature is yours for exactly one turn, and you have to want that.