Who Has the Lucky-Duck in Class 4-B?

Victorias had her little white duck that hangs from a shiny key-chain ever since she was five. She thinks her secret treasure brings her good luck. But when Victoria loses her charm and Tommy finds it and soon passes it to Ralph. Its not long before Melissa swipes it and then Elfrida get the Lucky-Duck and gives it to Carrie. Whats so special about the Lucky-Duck in class 4-B? Does it really have the power to make wishes and dreams come true?