O'dahwr, Exhumed Tide

When you cast O'dahwr, Exhumed Tide, exile all
cards from your library. O'dahwr's power and toughness are each equal to the number of
nonland cards exiled this way.
At the beginning of each end step, each opponent reveals the top fifteen cards of their library. Put
the revealed cards on top of your library in any
order.
O'dahwr has protection from its owner.