Cognizant Sherpa

When Cognizant Sherpa enters the battlefield, reveal the top four cards of your library. You may put a creature or land card from among them into your hand. Put the rest into your graveyard.
Unearth {r}{g}, Sacrifice a Forest or Mountain ({r}{g}, Sacrifice a Forest or Mountain: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it w