This is probably not appropriate considering it’s about magic the gathering. But I’m a player and enjoy the philosophy of the color pie. So, one thing I sometimes find myself doing is assigning color combos to deities.
When it comes to the god (or gods) in the Abrahamic religions, I find that two common colors are white (civilization, law, unity, light) and black (self interest, sacrifice, ambition, darkness). This color combination typically means either someone who uses the group towards their own ends or governs the group through force. However, what third color I’d add would seem depend on what religious group I’m talking about.