Bituminous Blast (PC2) from Planechase 2012, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Raymond Swanland
• Card Text:
  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.