Nithlea, Apex of Balance

Nithlea, Apex of Balance's power is equal to the
number of cards in your exile. Nithlea, Apex of Balance's toughness is equal to the number of
cards in your graveyard.
Whenever Nithlea, Apex of Balance attacks,
reveal the top ten cards of your library. Put any
number of them into your exile and any number
of them into your graveyard. You may play cards exiled with Nithlea, Apex of Balance
this turn.