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It's not out of the realm of possibility to maybe make some money off of mobile MR game, either. If it's fun enough, then people will enjoy it even without the extreme level of background we have with the world. I'd certaibly share it with friends, since everyone has a phone these days.
We wouldn't be able to make any money off of it unless all the assets were original. Which means we'd need all the art to be either free use or made by us. Unless blitz, as the best artist among us, is willing to do the art for every included character, we'd have to make it free because we'd be using copyrighted images. Music would be easier because there's a lot of non-copyrighted music out there, but...
It'd also probably have to be single player only since, unless apple or android or both have some sort of system where app makers can use their servers, we'd have to put up money for a server to run it on for multiplayer.
I'm assuming the game you're talking about is one of those "battle card games" where the characters are cards that can level up and you battle them against generic enemies? Otherwise I'd have to look into the game.