Meteor Swarm

The unusual thing here is where the X sits. Most X burn spells scale the damage: pay more, deal more, hit one thing harder. This one fixes the payload at 8 and spends X on how many targets it can be split across. The mana math tells the whole story. At , going wider costs a mana per additional target while the damage pool never grows, so the efficient line is almost always to keep X small and concentrate the 8. Cast it for and you have a four-mana Fireball-shaped effect that only touches creatures and planeswalkers; every point of X above one buys reach, not power. That inversion (paying to divide a static amount rather than to inflate a variable one) makes it a board-management tool disguised as a big finisher: you can wipe two or three midsized threats in a single sorcery, or shave a planeswalker down alongside a blocker. The triple-red pip and the no-face restriction are the two clamps that keep it from being a generic X-spell; it will never point at a player, so it lives or dies on how much of the opposing board it can carry off at once.