Wrap in Flames

The "can't block" rider does more work here than the single point of damage, because this is an offensive enabler rather than removal. One damage spread across up to three creatures rarely kills anything larger than a token, so the spell's real job is to strip a defensive line right before an attack: ping a trio of would-be blockers to clear the way for an alpha strike, and chip in incidental damage on whatever was already wounded. The sorcery speed is the constraint that defines its window. You commit it on your own turn, before combat, which means no ambush value and no instant-speed bluff; the opponent sees the board clear and the swing coming. That telegraphing is the price for hitting three creatures at once, an effect that would warp combat math badly at flash speed. The variable target count ("up to three") lets it scale from a single key blocker to an entire wall, so it never sits dead in hand even when the opponent's board is thin. It is a finisher's accessory: a way for a stalled aggressive board to convert a clogged ground into lethal in one turn.