Iroh's Demonstration

Two mana buys you either a board-wide singe or a single clean four-damage strike, and the two halves answer opposite decks. The sweep mode is a soft asymmetric wipe, hitting only creatures your opponents control, which reads as a token-and-x/1 answer that leaves your own board intact. The targeted mode is a genuine removal spell that eats most midrange threats at a rate that would be unremarkable on its own. Neither half is filler, so one card does the work of a cheap sweeper against a go-wide deck and a two-mana kill spell against a fair one, and it never rots in hand against the matchup it wasn't drawn for. As a Lesson, it lives in the sideboard-fetch shell rather than the maindeck, which recasts the modality entirely: instead of committing at deckbuilding time to which half you'll need, you fetch the relevant mode after seeing the board, which is the real payoff of stapling flexible removal onto a Lesson. The sorcery-speed limit is what the flexibility costs: you commit before combat and get no instant-speed blowout, which is the line between a toolbox answer and a reactive one.