Throne of Eldraine will include 'Adventure' instant and sorcery subtypes, that are attached to a creature (or possibly just permanent) card. The reminder text says (Then exile this card. You may cast the creature later from exile.)
Can the creature always be cast from exile (obeying normal rules for casting creatures)? (For instance, if the card was in the graveyard, and then the graveyard was exiled) Or can it only be cast from exile if the card was put into exile by resolving the Adventure?
IE: Does the reminder text serve to remind that creatures attached to Adventure subtypes can be cast from exile, or does resolving an Adventure create an additional effect that allows you to cast the attached creature from exile?