Kanizon, Worldly Undertaker

When Kanizon, Worldly Undertaker enters the battlefield each player must exile X permanents where X is this creatures power. You may play
any number of the exiled cards as long as Kanizon, Worldly Undertaker is out on the battlefield. You may spend mana as though it were mana of any color to cast them. When Kanizon, Worldly Undertaker is sent to the graveyard, put all remaining exiled cards into the owner's graveyard, then shuffle your graveyard into your library.