It's been discussed about recreating our own chaotic site, well unity really is too complicated for that. A website i've seen, is https://tradecardsonline.com, it's a great website with pretty much a full database of all the chaotic cards (missing some promos). You can build decks, and challenge others using their online games feature. The battle board is set up like a chaotic format 6v6, but the functions of the cards and the play ability is below par. It requires you to set up your deck like you would offline, instead of entering the game pre-made. If you know how to play, it's fairly easy to understand the set up.
But it's something to start with, if we can't contact them and help them improve it, we could at least learn how they made theirs, so we can create our own battles without crazy stuff like unity.
It's an idea atleast.
Admin Edit: Trade Cards Online Tutorial