Historical Rules · 15 February 2021
Rule 702.142d
Official source text from the 15 February 2021 Rules release
If an effect states that a card in exile becomes foretold, that card becomes a foretold card. That effect may give the card a foretell cost. That card may be cast for any foretell cost it has after the turn it became a foretold card has ended, even if the resulting spell doesn’t have foretell.