I decided to start by reading this excellent book. Some notes below.

Howard, J. and CRC Press LLC (2017) Game Magic : A Designer's Guide to Magic Systems in Theory and Practice. 1st edition. Abingdon: CRC Press [Imprint] Taylor & Francis Group.

https://learning.oreilly.com/library/view/game-magic/9781466567870/chapter-01.html

First chapter

Second chapter