Activate this Skill during your Main Phase. Discard 1 card, then Fusion Summon 1 "Elemental HERO" Fusion Monster from your Extra Deck, using monsters from your hand or field as Fusion Material. If Summoning an "Elemental HERO" Fusion Monster this way that requires 3 or more materials, and you control 2 "Elemental HERO" monsters that are mentioned on it as materials, you can also use monsters in your Deck as Fusion Material. This Skill can only be used once per Duel.