When Dire Fleet Daredevil enters the battlefield, exile target instant or sorcery card from an opponent's graveyard. You may cast that card this turn, and you may spend mana as though it were mana of any type to cast that spell. If that card would be put into a graveyard this turn, exile it instead.
1/19/2018 The effect of Dire Fleet Daredevil doesn’t change when you can cast the exiled card. For example, if you exile a sorcery card, you can cast it only during your main phase when the stack is empty.
1/19/2018 Casting an exiled card causes it to leave exile. You can’t cast it multiple times.