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While playing Soraka i thought it would be extremely useful to be able to have mana bars over people's head like the health bars. My idea is just a thin blue line underneath the red health bar. I know you can click on people to look at their mana but during battles its kind of hard to click through everyone to find a good target to give mana to.
While especially useful for Soraka, this would also be helpful for coordinating team attacks and so you could quickly look to see how everyone is doing on mana.