Sungold Barrage

The toughness clause reverses the usual instinct of white removal. Most efficient white kill spells hedge toward small threats: exile the attacker, tap down the token swarm, punish the cheap aggressor. This one refuses to touch anything with toughness 3 or less, so the mana dorks, the one-drop hatebears, and the go-wide fodder all walk past it untouched. What it buys instead is unconditional destruction of the things white historically struggled to answer cheaply at instant speed: the fatty at the top of the curve, the resilient midrange body, the creature whose back end is too big for a damage-based answer to finish. That inversion is the design point. Burn (the red model) scales badly against high toughness, since a fixed pile of damage stops mattering once the creature is fat enough; white's own answers have usually been exile or a tempo-negative tap. Anchoring the target restriction to toughness rather than power lets a cheap white instant reach the exact creatures burn spells bounce off, while leaving the small stuff for a format's cheaper removal to mop up. Destroy rather than exile is what keeps the mana cost this low, and the trade is real: an indestructible threat shrugs it off entirely, where an exile clause would have carried the day. Being an instant is the last piece, letting you hold it in hand until a qualifying creature is actually on the board and worth the card.