Umm... no. If your MC has magic, then magic in your world needs rules. Period. The reader's ability to have interest in the story fails if they cannot understand exactly what your MC is and is not capable of. There will be no tensions and no stakes without those limitations. It doesn't matter what other window dressing you put up.
As I said, you can give any flavor text or back-story to the origins of magic that you want. The 3 core principles are AWLAYS the same. You need to clearly define hard magic Vs low magic. You need to clearly make a choice on hard Vs. soft. And, if you are going with hard magic, you need to have a solid outline of what your magic system CAN NOT do. The limits are more interesting than the capabilities when it comes to magic.
Also, if you are using a soft magic system, you absolutely cannot give magic to the MC. Magic should also be somewhat rarely encountered by the main cast in a soft magic system.
It is sounding more and more to me like you should probably take a look at some videos on magic systems before you start with this based on some of the things I'm hearing here. It was kind of a red flag that you'd never even heard those terms I used before, a magic system is simply not functional if you have not considered those three things.
I'll start you off by linking one. I strongly recommend you do more research on your own from here though. I don't consider this video to be an authority on the subject. (As a matter of fact, I'm writing this having not even searched up the video or having a specific video in mind yet.) However, it should help you get your mind on the right track.
*Searches video.* Yep, this one is pretty good for a start. Actually, after reviewing it, I think it has exactly what you need to hear in it.