I contribute to Wikipedia and maintain a few articles there, and I would not consider Magic Duel notable nor would the vast majority of the more significant contributors. I think you guys have a significant misunderstanding of what Wikipedia is.
Wikipedia is not an indiscriminate assortment of articles. It is not a source of news, nor a place to document what you believe is interesting. It is not an outlet for original thought, primary research, or even direct documentation. It is not a manual, not a directory, and most definitely not a place for advertisement.
Wikipedia is a free open encyclopedia that is provided in a variety of languages. Stop and think about that for a second. You are trying to submit Magic Duel as part of an encyclopedia, a game that hasn't even reached the end of its alpha cycle that has a relatively small user base and has never once been mentioned by a vetted reputable source in any context even in passing.
It doesn't matter how unique the game is, or whether it's excellent or horrible -- it must be notable with objective evidence to support that claim.