[MunchkinMan]

If you have a card that gives you an ability, and then you lose that card, you lose that ability. The only case where you get to keep the benefits of a card-granted ability are when you discard a card to power the ability. Thus, if you get a combat bonus from discarding a card because of your Class, then discard the Class, you get to keep the bonus. But no, once you lose a card that lets your character use something out of the ordinary, you'll lose the ability to use that Item.