D/D/D Dragonbane King Beowulf [SDPD-EN041] Ultra Rare

1 "D/D/D" monster + 1 "D/D" monster If a "D/D" monster you control attacks a Defense Position monster, inflict piercing battle damage to your opponent. Once per turn, during your Standby Phase: You can destroy all cards in the Spell & Trap Zones.