YuGiOh Battle Pack: Epic Dawn Starfoil Exarion Universe BP01-EN126

Dark. Beast-Warrior/Effect. 4. 1800/1900. Activate this effect only during your Battle Step. This card loses 400 ATK and during battle between this attacking card and a Defense Position monster whose DEF is lower than the ATK of this card, inflict the difference as Battle Damage to your opponent. This effect continues until the End Phase of this turn.