Gandora the Dragon of Destruction [JUMP-EN028] Ultra Rare Trap Other monsters you control cannot

Other monsters you control cannot declare an attack

Set: Shonen Jump Magazine Promos Card type: Effect Monster Rarity: Ultra Rare Attack: 3000 Defense: 2500 Cannot be Normal Summoned/Set

this monster cannot attack

then if its ATK has been reduced to 0 as a result

Cannot be activated as Chain Link 2 or higher

Gandora the Dragon of Destruction [JUMP-EN028] Ultra Rare Trap Other monsters you control cannotSet: Shonen Jump Magazine Promos Card type: Effect Monster Rarity: Ultra Rare Attack: 0 Defense: 0 This card cannot be Special Summoned. You can pay half your Life Points to destroy and remove from play all other cards on the field. For every card that is removed by this effect, this card gains 300 ATK. This card is sent to the Graveyard at the End Phase of the turn it was Summoned.