You can only activate this card when 1 monster with an ATK of 1500 points or less is Special Summoned to your side of the field while there is a face-up monster on your opponent's side of the field. Special Summon all cards with the same name as the Summoned monster from your hand, Deck, and Graveyard in face-up Attack Position. Your opponent selects 1 monster on their side of the field and Special Summons all cards with that same name from their hand, Deck, and Graveyard.