I have a couple of suggestions on the GU wiki.
First, even though the background graphic is really beautiful, it makes the wiki pretty difficult to read. I would recommend setting at least the background of articles to a solid color that makes the reading easier.
Second, it might be good to add some more topic stubs to the main page for things like Onboarding, the new evolution system, and so on. Someone recently created an article Deck Building and Resource Basics which is really good and could be added to the main page, perhaps under a "Deck Building" stub. In general, it would be good to have stubs created for any topic that could be useful for a beginner.