Armory Arm (DP08-EN016) - Duelist Pack 8: Yusei Fudo Unlimited

1 Tuner + 1 or more non-Tuner monsters
Once per turn, you can equip this card to a monster OR unequip it to Special Summon this card in face-up Attack Position. While equipped to a monster by this effect, that monster gains 1000 ATK. While equipped by this effect, that target gains 1000 ATK. If that target destroys a monster by battle and sends it to the Graveyard: Inflict damage to your opponent equal to the ATK of the destroyed monster in the Graveyard.