Search target opponent's library for a card and exile it face down. Then that player shuffles their library. You may look at and play that card for as long as it remains exiled.
6/1/2011 Other players, including the card’s owner, can’t look at the card while it remains exiled.
6/1/2011 Playing a card exiled with Praetor’s Grasp follows all the normal rules for playing that card. You must pay its costs, and you must follow all timing restrictions, for example.