Red-Eyes Black Dragon Sword (DLCS-EN063) - Dragons of Legend: The Complete Series 1st Edition

Must be Special Summoned with "The Claw of Hermos", using a Dragon monster. If this card is Special Summoned: Target 1 other face-up monster on the field; equip this card to it. It gains 1000 ATK, and 500 ATK/DEF for each Dragon monster on the field and in the GYs.