Fairy Box (LON-EN024) - Labyrinth of Nightmare (Worldwide English) Unlimited

Each time a monster on your opponent's side of the field attacks, toss a coin and call Heads or Tails. If you call it right, the attacking monster's ATK becomes 0 only during the Battle Phase. Pay 500 Life Points during each of your Standby Phases. If you cannot, this card is destroyed.