Ashaya, Winter's Mentor

Lands your opponents control enter the
battlefield tapped.
Nonbasic lands you control have hideaway.
(They enter the battlefield tapped. When they do, look
at the top four cards of your library, exile one face
down, then put the rest on the bottom of your library.)
Landfall — Until end of turn, nonbasic lands
you control have "{u}, {t}: You may play the card
exiled with this land's hideaway ability without
paying its mana cost."