Fortissimo (SHVI-EN057) - Shining Victories Unlimited

Once per turn: You can target 1 "Melodious" monster you control; it gains 800 ATK until your next Standby Phase (even if this card leaves the field). You can send this card to the Graveyard; Fusion Summon 1 "Melodious" Fusion Monster from your Extra Deck, using monsters you control as Fusion Materials.