Superdreadnought Rail Cannon Gustav Max [LART-EN018] Ultra Rare 263 Set: Phantom Darkness Rarity: Ultra

Set: Phantom Darkness Rarity: Ultra Rare After activation

the selected card can attack as many times as the number of monster(s) on your side of the field when this card resolves

when your opponent activates a Spell/Trap Card during your Battle Phase

by Tributing 1 Thunder Effect non-Fusion Monster (in which case you do not use "Polymerization")

Superdreadnought Rail Cannon Gustav Max [LART-EN018] Ultra Rare 263 Set: Phantom Darkness Rarity: UltraSet: The Lost Art Promotion Card type: Xyz Effect Monster Rarity: Ultra Rare Attack: 3000 Defense: 3000 2 Level 10 monsters Once per turn: You can detach 1 Material from this card; inflict 2000 damage to your opponent.