Mosswort Bridge is a rare Land card from Lorwyn (LRW), collector number 270. Current market price: $2.64 (foil $74.79), TCGplayer market prices via Scryfall.
Hideaway 4 (When this land enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.) This land enters 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.