Gantelet Cassâme Samouraï Supralourd SP17-FR012

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