Wings of the Cosmos

The untap clause is doing the real work. A pump spell that only sizes up a defender spends a card to trade or survive; adding the untap gives it reach into blocks that shouldn't exist. A creature already tapped, whether it attacked or paid into an activated ability, can be untapped and declared as a blocker the opponent had no reason to play around, and the ambush lands where they counted on an open board. The +1/+3 split leans defensive by design: the extra toughness lets a small body eat something much larger, while the modest power keeps the spell from moonlighting as a finisher. Flying widens what that untapped creature can catch, letting a grounded body suddenly answer an evasive attacker. Everything expires at end of turn, so this is not an upgrade but a single-combat blowout: for one white mana, an attacker walks into a blocker that was supposed to be tapped out of the way, and dies to it. That is a clean one-for-one on the trade, but the value is in the surprise. It rewards a player who leaves mana open and threatens a defensive line the opponent cannot see, buying back a defender that was already committed elsewhere. It lives in the gap between a pure survival tool and a tempo swing, closer to a reset button on your own combat math than to any pump spell that just adds numbers.