Celestial Enforcer

The conditional on the tap ability is the whole design brief: a repeatable pacifier that only turns on once you have committed something with flying to the board. That gate turns the card into a payoff piece rather than a standalone control tool. A 2/3 body with nothing to do but block until you hand it a flying creature to babysit, at which point it becomes a soft lock on the opponent's best attacker, tapping the threat down before combat every turn. The activation cost of plus the tap means it competes with attacking and pressures the mana you would rather spend deploying, so the card wants to sit behind an evasive body and grind rather than race. This is build-around glue at common rarity, designed to nudge a white flyers deck toward committing more flyers, unremarkable in a vacuum but sharper once the archetype around it exists. What limits it is that the ability taps, it does not remove: it stalls a blocker or neutralizes an attacker for a turn, but it never trades, so a wide board simply plays around a single tap per turn. Its home is the deck that already has the sky covered and just needs a way to keep the ground from getting there.