Golos, Traveler of Planes

When Golos, Traveler of Planes enters the battlefield you may search your library for a Land and put it on to the battlefield tapped.
+1 Add {w},{u},{b},{r},{g} to your mana pool. Draw a card and discard a card.
-4 Exile the 4 cards of you library, you may cast 2 of them without paying their man cost.