Thorn of Malice (LDS2-EN117) - Legendary Duelists: Season 2 1st Edition

Equip only to "Black Rose Dragon" or a Plant-Type 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 and DEF. An opponent's monster that battles with the equipped monster cannot be destroyed by that battle.