Armed Dragon LV7 (Secret Rare) (SGX1-ENC08) - Speed Duel GX: Duel Academy Box 1st Edition

Cannot be Normal Summoned/Set. Must be Special Summoned by "Armed Dragon LV5", and cannot be Special Summoned by other ways. You can send 1 monster from your hand to the GY; destroy all face-up monsters your opponent controls with ATK less than or equal to the sent monster's ATK.