Mosswort Bridge [Lorwyn]

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.)
Mosswort Bridge enters the battlefield tapped.
T: Add G.
G, T: You may play the exiled card without paying its mana cost if creatures you control have total power 10 or greater.