Instant, 1UU (3)
Rare
Exile the top three cards of your library face down. You may look at those cards for as long as they remain exiled. Until your next turn, you may play those cards. At the beginning of your next upkeep, put any of those cards you didn't play into your graveyard.
Illus. George Pratt

10/4/2004: You can look at the three exiled cards at any time.
10/4/2004: You can only play them before the start of your upkeep. Between the start of your upkeep and putting the extra cards into the graveyard, you can't play them.
10/4/2004: To "play a card" is to either cast a spell or to put a land onto the battlefield using the main phase special action.
Official Reprint Policy (This card is on the reserved list)
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander