Gantelet Cassâme Samouraï Supralourd CROS-FR009

You can target 1 "Heavy Samurai" monster you control, equip that monster from your hand or your field to the target. It gains 400 DEF. During the Damage Step of each player, when a "Heavy Samurai" Defense Position 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, until the end of this turn, the DEF of your battling monster becomes double its original DEF.