In the Dusk of an Empire

Reveal the top X cards of your library, where X is
half of your life total. You may choose up to two historic cards from among them and exile them
with one dusk counter on each. Shuffle the rest
back into your library. (Round down.)
Exile all nonland permanents. Then, put each
card you own in exile with a dusk counter on it
onto the battlefield tapped. End the turn.