Armor Breaker (DP06-EN009) - Duelist Pack 6: Jaden Yuki 3 Unlimited

Once per turn, you can equip this card to a face-up Warrior-Type monster you control, or unequip it, and Special Summon this card in face-up Attack Position. While equipped to a monster by this effect, when that monster inflicts Battle Damage to your opponent, destroy 1 card on the field. (A monster can only be equipped with 1 Union Monster at a time. If the equipped monster would be destroyed by battle, this card is destroyed instead.)