Mnemosyne, Time Weaver

{3}{w}{u}, Exile this card from your hand: End the
turn.
When Mnemosyne enters the battlefield, if you
didn't cast it from your hand, exile it.
At the beginning of your endstep, you get an
emblem with: "At the beginning of each
opponent's upkeep, you may rearrange his or her library in any order"