Ah, a magic system—like a star map of possibilities. I imagine each spell is a point, and the rules are the invisible gravity that keeps them from scattering into chaos. If we let each spell pull from a single source—energy, emotion, or even a forgotten word—then we have a clear source, a rule that governs it. The richness comes from the variations in how you tap that source: a different incantation, a gesture, a relic, or the state of the moon. The constraints? Maybe a cost—time, memory, or a trade of a small piece of the caster’s essence. That keeps the system believable, yet each caster can still imagine new arcs, new combos. It feels like a sandbox, but with a map to keep the play from getting lost. What sparks your curiosity first?