The big SATURN (MAMS-EN065) - Magnificent Maestros 1st Edition

Cannot be Special Summoned from the hand or Deck. Once per turn: You can discard 1 card and pay 1000 Life Points; this card gains 1000 ATK until the End Phase. When this card in your possession is destroyed by your opponent's card effect and sent to your Graveyard: Both players take damage equal to this card's ATK in the Graveyard.