Leave in the Dust

The bounce-and-replace spell, set at the rate where the cantrip stops being free. Boomerang and Unsummon trade efficiency for nakedness: they push a permanent back to hand and leave you down a card for the privilege. This pays four mana to undo that math, returning any nonland permanent and refilling the slot in the same breath, so the tempo swing never costs you the resource that bounce spells usually mortgage. The price is the whole point: at instant speed for one less mana the effect would be a tournament problem, so it sits at a tempo-positive but card-neutral midpoint where it can answer an aura, return a problematic threat before combat, or reset a planeswalker without ever putting you behind on cards. It is the durdle-deck baseline for "bounce that doesn't hurt," the version of the effect built for the grinder rather than the racer. Nothing about it is flashy, and that restraint is deliberate: a card that did this much for less mana would have to be reckoned with, so it pays full freight to stay honest. What you get for the four is a temporary answer, a fresh card, and the assurance that the swing never widens the gap you are trying to close. The bounce is always undone next turn; what stays bought is the card in hand that keeps the exchange even.