Scry 2, then draw a card. (To scry 2, look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)
Illustrated by Svetlin Velinov · Magic 2011 · #70
There are no rulings for Preordain.
Scry 2, then draw a card.
Draw a card. Scry 2.
Scry 1. (Look at the top card of your library. You may put that card on the bottom.)
Draw a card.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)
Scry 4, then draw two cards.