Thorn of Malice (L5DD-ENA20)

Equip only to "Black Rose Dragon" or a Plant monster. It gains 600 ATK. If the equipped monster attacks a Defense Position monster, inflict piercing battle damage to your opponent. If the equipped monster attacks a monster, after damage calculation: The attacked monster loses 600 ATK/DEF. An opponent's monster that battles with the equipped monster cannot be destroyed by that battle.