Yeah that's of course true, most events have allowed proxies, but EW this year is firmly schedulded. So I think it isn't a good idea to build into a deck like Oaht, Paradoxical, DP Storm or other decks that clearly need all power and can't doing well without it.
Thank you really much for your helpful answer Brass Man. Now I have a lot of ideas for starting brewing, which is really hard, when you just new in a format. But I'll try. My gut tells me that I should try one of the first options first. Going full aggro or more prison style. Today I talked with an Workshop player at my Lgs and he thoughted about it, but didn't found a good build so far. Considering that maybe I should start on one of your other suggested points. But generally he would pick up a different deck...
I also thoughted of trading my Shops into first pieces of Power and try Grixis Xerox or Mentor. I have nearly all the cards for them in my binder, besides Power, so maybe that's just the better decision for getting into Vintage. I would be also fine with that.
But I am not totaly sure so far and I see, if I could bring a mox less list to work. I played a couple of matches today with Opal as a replacement and it was just awful
I started with Vintage two weeks ago on mtgo and really enjoyed the format and the matches. For me personally it's the best format next to legacy and now I am seriously thinking about putting a deck togheter for paper games, which is by far the better form of enjoying Mtg. Just to mention that
Fortunately I allready own 3 Mishra`s Workshop and a few other pieces for Mud and I consider to buy a fourth. But saddly I am not in such a financial position to buy the five Moxen and a Lotus. My question now is, if Mox Opal, Lotus Petal and maybe stuff like Grim Monolith, City of Traitors or Metalworker are acceptable replacements for the real Power in Workshop Aggro? I know that this replacements aren't as good as the originals, but when the deck still functions well with it and has a real game against the other Vintage decks, I would go for it. Otherwise just be honest and stop me from making a bad investment, even 1 Workshop is a load of money for me.
I know that most tournaments allow proxies, but I plan on going to Eternal weekend and one or two other sanctioned tournaments, too. So at least I need a deck without proxies.