Alchemist's Gambit (DBL) from Innistrad: Double Feature, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Zoltan Boros
• Card Text:
  Cleave 4UUR (You may cast this spell for its cleave cost. If you do, remove the words in square brackets.)
  Take an extra turn after this one. During that turn, damage can't be prevented. [At the beginning of that turn's end step, you lose the game.]
  Exile Alchemist's Gambit.