3 Elemental Hero monsters
Must be Fusion Summoned and cannot be Special Summoned by other ways. Once per turn, when this card is targeted for an attack: You can make this card s ATK become double its current ATK until the end of the Damage Step. At the end of the Battle Phase, if this card battled: You can target 1 monster on the field; destroy it. When this card is destroyed by battle or card effect: You can target 1 Level 8 or lower Elemental HERO Fusion Monster in your Graveyard; Special Summon it, ignoring its Summoning conditions.