Number 17: Leviathan Dragon [GENF-EN039] Ghost Rare Dinosaur you can activate this card

you can activate this card from your hand

Set: The Lost Millennium Card type: Fusion/Effect Monster Rarity: Ultimate Rare Attack: 2100 Defense: 1200 Elemental Hero Avian' + 'Elemental Hero Burstinatrix' This monster cannot be Special Summoned except by Fusion Summon

After damage calculation

take 500 damage

Number 17: Leviathan Dragon [GENF-EN039] Ghost Rare Dinosaur you can activate this cardSet: 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.