Des Volstgalph (SJC-EN002) - Shonen Jump Championship Series Promos Limited

Each time this card destroys an opponent's monster as a result of battle and sends it to the Graveyard, inflict 500 points of damage to your opponent's Life Points. Also, each time either player activates a Normal or Quick-Play Spell Card, increase the ATK of this card by 200 points until the end of the turn. (This effect is even applied during your opponent's turn.)