What's your favourite Magic (System) in all of fantasy?

I recently saw a video about the "magic system paradox" (tldw: magic systems don't feel like magic because they're systems and systems are understandable while magic should be something supernatural). I would be very interested to hear about your favourite magic in a work of fantasy to see if supernatural magic or systematic magic is enjoyed more. I feel like most answers will be magic systems since 1. there are way more of them and 2. they are just more memorable since they can be more specific and not just "some magical power". Despite that I want to see if there are some non-system magics out there that have a special place in someones heart. And just because I'm a nerd I want to hear as much as possible about any magic system you feel like infodumping about (even if you don't feel like they don't add much to what I talked about in this post)