Still sorta OP, unless you can dark hole the pendulum slots, then its not that bad. Or destroy them with grapha, ext...

1. I've seen 24 year olds with real santa beards, so yeah. Though I think thats DOTA 2's warlock, and I think hes like a 60 year old librarian in universe. But you can't adventure well at 60 :P.

2. Special works fine. Its not an XYZ central deck, but it does use them since its a 15 card utility 'extra' deck. The most commonly used ones would probably be Leviar and Zenmanes or something. Basically stuff that expands what dark world can do. If you want a XYZ professor instead, I can very very easily change his deck to Hieratic.