The Big Saturn (SDMM-EN020) - Structure Deck: Machina Mayhem Unlimited

This card cannot be Special Summoned from the hand or Deck. Once per turn, during your Main Phase, you can discard 1 and pay 1000 Life Points to have this card gain 1000 ATK until the End Phase. When this card is destroyed and sent to the Graveyard by an opponent’s card effect, both players take damage equal to this card’s ATK.