Design Magic as Exchange, Not Entitlement
The richest witchcraft systems work on reciprocity: you give, you receive. The land, the spirits, the universe, the debt all have to be balanced. This framework does more than create rules. It creates a moral logic for the magic. A witch who takes without giving becomes something darker. A witch who gives too much loses themselves. The exchange structure means that every act of magic is also a character decision with ethical weight. What are they giving? What are they willing to give? What won't they give, and what happens when they're desperate enough that the answer changes?