Yugi’s classmate Bakura, possessed by his Millennium Ring’s dark powers, traps Yugi and friends in a Shadow Game where they become the cards themselves!  Not only must Yugi battle to avoid becoming a permanent part of the card game, but also free Bakura’s soul from the Millennium Ring’s control!
He might play another Morphing Jar, so it's too dangerous to keep Anzu's soul card in my hand.