2018-06-08 : Casting an exiled card causes it to leave exile. You can't cast it multiple times.

2018-06-08 : If you don't cast the exiled cards, they remain exiled. They can't be cast on later turns.

2018-06-08 : Stolen Strategy 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.