You can target 1 Superheavy Samurai monster you control; equip this monster from your hand or field to that target. It gains 400 DEF. During either player s Damage Step, when a Defense Position Superheavy Samurai monster you control battles an opponent s monster, and you have no Spell Trap Cards in your Graveyard: You can send this card from your hand to the Graveyard; your battling monster s DEF becomes double its original DEF until the end of this turn.