Seraphina, the Foresight

All nonland cards in your hand, library, exile, or
graveyard have foretell. Their foretell cost is
equal to their mana cost. Whenever you foretell
a spell, put a plan counter on all other foretold
spells you have. The foretell cost of every spell in
exile is reduced by the number of plan counters
on the spell. This cost reduction can effect
colored mana. At the beginning of the game, if
Seraphina is your commander, you may have
Seraphina become an emblem. If you do, it gains
"you can't cast spel