Ok, this may be a stupid question, but I see all these deck suggestions and even play against decks in PVP that have 2 or 3 copies of cards that I can only have one of. Ex. I have 3 Silent Magicians (the EX kind), but it will only let me put one in my deck. Then I battled someone in PVP and they used 3. Why can’t I? Same thing with Wonder Wand, I have 3 copies of it, but can only put one in my deck. Meanwhile, I see another PVP duelist use 3 Wonder Wands. Am I missing something or just stupid? Lol!
Obviously something is wrong on your side. All the cards you mentioned are not being limited so you should have no problem using more than 1 copy. Maybe post a screenshot of the error you getting or something and we will see
I see you trying to use duplicate mod, it's not going to work.