[Astromancer]

To add a race against time feel to the game bring in Morgan le Fay as an ambiguous ally with vital information. (Remember Margan often allied with her brother against common foes). Have Morgan explain that no one knows/understands the correct magic for modern day Earth. Magic is just as strong as it ever was but no one really knows how to do it now.

Thus you have a background race between Margan and Jadis to figure out how to cast potent magic in the modern world. Spying on each of the Invisible Colleges would be a major feature of the game. First with real power wins!