@Meddler: What are your thoughts on a Champion with two resource bars?

The Demon Hunter in Diablo 3 uses two different resources: Hatred and Discipline. Hatred fuels offensive abilities, while Discipline is meant for defensive or evasive abilities. Pretty fun for gameplay.

Presently, League has no Champion I can think of with two different resource bars used for abilities. It'd probably be very difficult to create due to the limit on available skills, but I doubt it'd be impossible.

Any thoughts on this? What would be the challenges in making such a Champion? What kind of gameplay would you look for if making a Champion with said resource system?