Counterflux (RTR) from Return to Ravnica, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Scott M. Fischer
• Card Text:
  Counterflux can't be countered by spells or abilities.
  Counter target spell you don't control.
  Overload 1UUR (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each.")