Geistflame Reservoir (DBL) from Innistrad: Double Feature, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Anna Christenson
• Card Text:
  Whenever you cast an instant or sorcery spell, put a charge counter on Geistflame Reservoir.
  1R, T, Remove any number of charge counters from Geistflame Reservoir: It deals that much damage to any target.
  1R, T: Exile the top card of your library. You may play that card this turn.