Enchant instant card in a graveyard (Target a(n) instant card in a graveyard as you cast this. This card enters the battlefield attached to that instant card in a graveyard.) Whenever you cast a sorcery spell, copy the enchanted instant card. You may cast the copy without paying its mana cost. If you do, exile the enchanted card and attach Spellweaver Volute to another instant card in a graveyard.