When this card is activated: You can target 1 face-up monster your opponent controls, it loses 800 ATK. If the current ATK of a monster is different from its original ATK, that monster cannot activate its effects or declare an attack. Once per turn, if this card is sent to the GY: You can add this card to your hand. You can only activate 1 "World Heritage - Heaven Chamber, Coel" per turn.