Sealed Tome

While you're searching your library, you may cast Sealed Tome from your library.
When you cast Sealed Tome, each player exiles the top five cards of their library face down.
{4}: Choose a face-down card exiled with Sealed Tome and turn it face-up. If is a land card, put it onto the battlefield tapped. Otherwise you may cast it without paying it's mana cost. Any player may activate this ability.