Number 17: Leviathan Dragon [GENF-EN039] Ghost Rare CRU097 you cannot declare an attack

you cannot declare an attack

attach this card from your hand or field to it as material

The ATK and DEF of a monster that destroys this card as a result of battle is decreased by 500 points

This card is not destroyed as a result of battle at any time or by the effects of Spell or Trap Cards

Number 17: Leviathan Dragon [GENF-EN039] Ghost Rare CRU097 you cannot declare an attackSet: Generation Force Card type: Xyz Effect Monster Rarity: Ghost Rare Attack: 2000 Defense: 0 2 Level 3 monsters Once per turn: You can detach 1 Xyz Material from this card, this card gains 500 ATK. If this card has no Xyz Materials, it cannot attack your opponent directly.