Quote Originally Posted by Gametime View Post
So wizards aren't undefeatable if you disallow wizards from doing the things that make them undefeatable.

I think we'd all be comfortable agreeing with that statement, but it doesn't say much about the capabilities of a wizard that isn't restrained by this hypothetical D. M. Everyman.
If these are the pretenses we are operating under, then the very first reply in this thread answers the question. I think the only reason that the thread reached 15 pages is because the pretenses weren't well-defined enough. I apologize for assuming that mine were "right", but they were based on what I thought the OP was asking for. It's really up to him (and anyone who is asking themselves this question) to decide which of the answers given is right.