How to Test a New Magic System?

The best place to start with any of this, I honestly think, is to figure out how rational you want your system to be. The more rational your magic is, as we've talked about, the bigger a deal the implications become. If you're doing a irrational magic system, don't start coming up with new effects because you're just making your problem worse or you're compounding what you have to analyze. But just start exploring what would it look like in this situation? What would people over here use it for?"