If you want to learn more about the MTG color wheel or MTG design in general check out the "Drive to Work" podcast by Mark Rosewater, the lead designer of magic. Dude is wicked smart and very humble.
So there is a lot of content about designing for humans and little about detailed number-crunching and game balance.
He also explains most terminology and concepts, so a passing familiarity should be more than enough to understand the MtG-related content.
Also, no ads.
[1] https://mtg.gamepedia.com/Drive_to_Work
[2] Cards are released in groups, called sets. A set (usually) takes place on a particular world and is connected to a part of the larger story, which are reflected in its gameplay.