Planar Guide

Buried inside a one-mana Cleric is a board wipe that nobody owns and everybody resets. Pay the activation, exile the Guide itself as part of the cost, and every creature in play vanishes, returning at the next end step under their owners' control. The mechanism is a mass blink rather than a destruction effect, and that distinction governs everything: nothing dies, no death triggers fire, and every enters-the-battlefield ability re-fires when the creatures come back. So it functions as a Wrath that respects your own engine and punishes someone else's: counters fall off, auras and equipment slide away, tokens cease to exist because there is no card to return, and anything with a comes-into-play trigger doubles up. The end-step return window is the wrinkle worth dwelling on, since it empties the battlefield of creatures and then refills it a phase later, a gap careful players schedule around combat, around summoning sickness, around an opponent's blockers. The Guide does not come back with the rest, because exiling it is part of the activation cost rather than the effect: by the time the ability is on the stack the body is already gone, so there is no responding by killing the Guide to stop it. That self-consumption, plus the four-mana price on top of the casting, is the brake. It works better as a tutor target and toolbox piece than a dependable answer, doing one strange, specific thing nothing else in white does quite the same way.