Delayed Blast Fireball

Delayed Blast Fireball deals 2 damage to each opponent and each creature they control.
If this spell was cast from exile, it deals 5 damage
to each opponent and each creature they control instead.
Foretell {4}{r}{r}(During your turn, you may pay {2} and exile this card from your hand face down.
Cast it on a later turn for its foretell cost.)