Cyberdark Keel (DP04-EN009) - Duelist Pack 4: Zane Truesdale Unlimited

When this card is Normal Summoned, select 1 Level 3 or lower Dragon-Type monster in your Graveyard and equip it to this card. This card gains ATK equal to the equipped card's ATK. When this card destroys an opponent's monster by battle, inflict 300 damage to your opponent. If this card would be destroyed by battle, the equipped monster is destroyed instead.