(BT02): The aura shall cause the body to be as hard as steel. (TD05): Steel ball. A unique material, made from iron sand to forge Katanas. Also, the name of a technique to increase the strength of a body.
Ability / Effect
[Counter] Choose a 《Ninja》 in battle, and for this battle, give it power+3000, defense+3000, and [Counterattack]! ([Counterattack]: If this card is still on the field after an attack, choose a monster that attacked with defense less than or equal to this card's power, and destroy it.)