Scorching Dragonfire is a common Instant card from Duskmourn: House of Horror (DSK), collector number 156. Current market price: $0.15 (foil $0.21), TCGplayer market prices via Scryfall.
Scorching Dragonfire deals 3 damage to target creature or planeswalker. If that creature or planeswalker would die this turn, exile it instead.