Sulfurous Blast is a common Instant card from Commander Masters (CMM), collector number 262. Current market price: $0.33 (foil $0.18), 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.