Leyline of the Total Eclipse

If Leyline of the Eclipse is in your opening hand,
you may begin the game with it on the battlefield.
Whenever a non token permanent you control is
put from the battlefield into your graveyard you
may pay {3}. If you do, exile target non land
permanent an opponent controls until the card
leaves your graveyard.
If Leyline of the Eclipse would leave the battlefield, return all cards exiled by it's ability
to the battlefield.