Starnheim Unleashed
Sorcery
Oracle Text
Create a 4/4 white Angel Warrior creature token with flying and vigilance. If this spell was foretold, create X of those tokens instead. Foretell
(During your turn, you may pay 
and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)
Rules for this card
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A keyword ability that lets a player exile cards from their hand and cast them for an alternative cost on future turns. See rule 702.143, “Foretell.”
Rulings (4)
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Wizards of the CoastCasting a foretold card from exile follows the timing rules for that card. If you foretell an instant card, you can cast it as soon as the next player’s turn. In most cases, if you foretell a card that isn’t an instant (or doesn’t have flash), you’ll have to wait until your next turn to cast it.
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Wizards of the CoastYou choose the value of X in the foretell cost as you cast the spell. You’ll pay for one Angel Warrior token,
for two, 
for three, and so on.
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Wizards of the CoastBecause exiling a card with foretell from your hand is a special action, you can do so any time you have priority during your turn, including in response to spells and abilities. Once you announce you’re taking the action, no other player can respond by trying to remove the card from your hand.
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Wizards of the CoastIf you’re casting a foretold card from exile for its foretell cost, you can’t choose to cast it for any other alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, those must be paid to cast the spell.