Maybe. I've played Duelyst. Magic the gathering, runescape cards online. Hearthstone and probably some other shit I can't recall. I did used to have yu gi oh and pokemon cards though. Give me the gravy colonel. What's the rough concept for the card system? Because right off the bat for something like Guild I would suggest: you have a singular character. You have slots. Slot use equipment or abilities. You can have minions or armies but they take up slots. Each slot you buy decreases your max HP or some shit.