I saw that ygo is going to add a cpu feature for you to play against computers instead of people. A good feature if you're offline. But I thought of something if it wasn't thought of. For the computer, You can try to add a format that you can play against people's decks that won a YCS or other tournaments. It'l be a good way for people to test decks against the pro's decks and maybe top 3 decks. Update it and just keep compiling of lists of winning decks.