does jack skellington from set 2 work for nobodies also? i was just wondering if his effect will pick up in set 4.

umm from what I read Jack Skellington would effect the nobodies that are on the field only not the ones in the hands as the organization cards says that they are treated as dark cards after on the field but they are still nobodies in the hand.

Ah! But then you'd have to be playing against a XIII deck to begin with.

Same rule applies here as it does for cards like Phil. If you want the benefits of the new set, the card has to be from the new set.