Nitro Warrior [CT05-ENS02] Secret Rare Hidden Summoners You can only use this

You can only use this effect of "Subterror Behemoth Ultramafus" once per turn

Set: Duelist Pack 1: Jaden Yuki Card type: Effect Monster Rarity: Common Attack: 800 Defense: 1200 If this is the only card in your hand

Set: OTS Tournament Pack 3 Card type: Fusion Monster Rarity: Common Attack: 1500 Defense: 1200 "Fusionist" + "Enchanting Mermaid"

and Evil Hero monsters you control

Nitro Warrior [CT05-ENS02] Secret Rare Hidden Summoners You can only use thisSet: 2008 Collectors Tin Card type: Synchro Effect Monster Rarity: Secret Rare Attack: 2800 Defense: 1800 "Nitro Synchron" + 1 non Tuner monsters Once during each of yours turns, if you activated a Spell Card, this card gains 1000 ATK during its next attack, for damage calculation only. Once per turn, if this attacking card destroys an opponent's monster by battle, you can change 1 face up Defense Position monster your opponent controls to Attack