if there are instants in the piles of Fact or Fiction can you cast them from the pile before choosing?
if there are instants in the piles of Fact or Fiction can you cast them from the pile before choosing?
No. At that point, Fact or Fiction is in the middle of resolving, so you can't play anything.
Besides which, the cards in the piles are still in your library, not in your hand.
Fluttershy is best pony.