Officially, Un-cards don't exist. In fact, many cards are in the Un-sets specifically because the rules team couldn't figure out how to make them work within the official rules (Staying Power is such an example. Rocket-Powered Turbo Slug was another, although the Future Sight pacts captured the spirit pretty well). Randy Buehler even went on the record saying that he didn't know the ramifications of R&D's Secret LairR&D's Secret Lair.
In the specific case of The Cheese Stands Alone, the only reason it wasn't reprinted in Eighth Edition was because having a tournament-legal Unglued printing would have caused rules problems, so instead Future Sight ended up with Barren Glory. So a reasonable casual rule would be to say that The Cheese Stands Alone is functionally Barren Glory, if someone wants to split hairs.