You can only activate this card when there is a face-up "Elemental Hero Bubbleman" on the field. Change 1 "Elemental Hero Bubbleman" in face-up Attack Position on your side of the field and 1 monster in face-up Attack Position on your opponent''s side of the field to Defense Position. Tribute the "Elemental Hero Bubbleman" that was changed to Defense Position and Special Summon 1 monster from your hand that includes "Elemental Hero" in its card name.