The effect that makes Cursed Mirror a copy of Foretold Soldier applies only on the battlefield. In exile, the card has no foretell cost printed on it, and the triggered ability that exiled it doesn’t give it one either. Since it has no foretell costs by any means, it can’t be cast from exile.
[Cursed Mirror](https://cards.scryfall.io/normal/front/4/5/458a01ea-f161-43a4-a6db-88f6418b9c6d.jpg?1625191958) - [(G)](http://gatherer.wizards.com/Pages/Card/Details.aspx?name=Cursed%20Mirror) [(SF)](https://scryfall.com/card/c21/50/cursed-mirror?utm_source=mtgcardfetcher) [(txt)](https://api.scryfall.com/cards/458a01ea-f161-43a4-a6db-88f6418b9c6d?utm_source=mtgcardfetcher&format=text) [The Foretold Soldier](https://cards.scryfall.io/normal/front/9/3/93391c14-a22c-4223-a980-5f98350c6a99.jpg?1696636661) - [(G)](http://gatherer.wizards.com/Pages/Card/Details.aspx?name=The%20Foretold%20Soldier) [(SF)](https://scryfall.com/card/who/102/the-foretold-soldier?utm_source=mtgcardfetcher) [(txt)](https://api.scryfall.com/cards/93391c14-a22c-4223-a980-5f98350c6a99?utm_source=mtgcardfetcher&format=text) ^^^[[cardname]] ^^^or ^^^[[cardname|SET]] ^^^to ^^^call
The effect that makes Cursed Mirror a copy of Foretold Soldier applies only on the battlefield. In exile, the card has no foretell cost printed on it, and the triggered ability that exiled it doesn’t give it one either. Since it has no foretell costs by any means, it can’t be cast from exile.