Bituminous Blast is a uncommon Instant card from Modern Horizons 3 Commander (M3C), collector number 255. Current market price: $0.32, TCGplayer market prices via Scryfall.
Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.) Bituminous Blast deals 4 damage to target creature.