Sulfurous Blast is a uncommon Instant card from Time Spiral (TSP), collector number 180. Current market price: $0.29 (foil $0.65), TCGplayer market prices via Scryfall.
Sulfurous Blast deals 2 damage to each creature and each player. If you cast this spell during your main phase, Sulfurous Blast deals 3 damage to each creature and each player instead.