Windbrisk Heights [From the Vault: Realms]

Hideaway 4 (When this land enters the battlefield, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.)
Windbrisk Heights enters the battlefield tapped.
T: Add W.
W, T: You may play the exiled card without paying its mana cost if you attacked with three or more creatures this turn.