Nothing but love and respect for Mage: The Ascension (although, its revised variant Awakening arguably has better rules).

Probably one of the most open concept magic systems, you're really encouraged to get wild with character concepts and backstory.

Conflicts can exist as a direct action/thriller narrative, but longer arcs encourage more intrigue and social conflict. Players must constantly conceal their powers, lest naive bystanders disrupt your magics with their natural skepticism.

Villains run the ideological spectrum. Neoliberal Technocracy seeks to quash individuality in pursuit of world domination. Nihilist cults, grown poisonously cynical, court Elder Gods to corrupt and dissolve reality. Self-obsessed egomaniacs completely rewrite reality in their own mad image.

I'm a shameless stan for World of Darkness / Onyx Path games, but Mage is far and away my favorite line in the franchise.