Banefire (DDN) from Duel Decks: Speed vs. Cunning, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Raymond Swanland
• Card Text:
  Banefire deals X damage to target creature or player. If X is 5 or more, Banefire can't be countered by spells or abilities and the damage can't be prevented.