Slagstorm

The choice is the whole design, and it splits the card into two jobs that rarely want the same red deck. The first mode is a clean three-to-each board wipe at three mana, the rate that makes it a sweeper for going-wide aggro and small-creature midrange. The second mode ignores the board entirely and points three damage at every player, which is what separates this from the long line of symmetrical red sweepers it descends from: where Pyroclasm and Anger of the Gods only clear creatures, this lets a red deck that has fallen behind on the board pivot to the life totals instead, finishing an opponent who stabilized behind blockers without committing to the same trade. The card as a whole folds a Pyroclasm-style wrath and a closing burn spell into a single sorcery, but the cost of that flexibility is that you only ever get one half: you cannot clear the board and reach the dome in the same cast, so the decision lands squarely on which problem is actually killing you. Three damage is the calibration that holds both modes together, large enough to sweep most early aggressive boards while staying symmetrical against you, small enough that the player-damage mode is a genuine clock-shortener rather than a guaranteed kill. It asks you to read the table before you tap out, and rewards picking the right column.