Myra the Magnificent (Showcase): Unfinity

Whenever you cast an instant or sorcery spell from your hand, open an Attraction. {X}, {T}: Exile target instant or sorcery card with mana value X from your graveyard and choose an Attraction you control that doesn't have a midway counter on it. Put a midway counter on it. Whenever you visit that attraction, copy the exiled card. You may cast the copy without paying its mana cost.