Sealed Grimoire

Sealed Grimoire does not untap on untap steps. {Pb}{Pb}{Pb}{T}: Open the envelope labeled “Grimoire“, if the envelope is empty, choose target permanent. Exile it and put it into the envelope. If the envelope has something within, put that card into your hand. {x}{1}: Put Sealed Grimoire and X amount of cards from the graveyard onto the top of the Library in a random order.{flavor} what secrets were sealed within this tome? do you dare find out?