Hail of Arrows

Where most white removal aimed at attackers picks one creature and kills it outright, this spends its damage like a budget across the whole assault. The X is a pool you parcel out among any number of attacking creatures, which makes it a Fog that bites back: it can blunt a wide swarm by finishing several small bodies at once, snipe two or three specific threats, or dump everything onto a single huge attacker. The constraint that pays for that flexibility is the word "attacking." This never touches blockers, never trades during your own offense, and sits dead in hand until the opponent commits to the red zone. That narrow window is the whole bargain: an instant that wants to be held, cast in the declare-attackers step once the opponent has overextended, turning a profitable swing into a board-clearing blowout. It scales with the game, too, since the X cost means the spell grows in proportion to how much the opponent has poured onto the table. The lineage is white's recurring answer to the go-wide problem: not a sweeper that asks nothing of timing, but a combat-step reckoning that rewards the defender who waits for the right moment to spend.