Wu Yang, the Path-Crafter

When Wu Yang, the Path-Crafter enters the
battlefield, and at the beginning of your upkeep,
exile cards from the top of your library until
you exile an instant or sorcery spell and put the
rest on the bottom of your library in any order.
At the beginning of your end step, if this isn't
an extra turn, you may cast a copy of each card
exiled by Wu Yang.