User blog comment:SirAston/Thoughts and suggestions regarding Summoner Spells/@comment-3297251-20130808232421/@comment-5331854-20130809082205

Clarity is, as far as I can see, in a fine spot, just a bit underused in lower division plays. I also don't see the need to give manaless champions an advantage from Clarity (because this edge would be very hard to balance). Energy champs have their own means of restoring Energy, they profit from Blue and they shouldn't mindlessly spam their skills anyway. Fury champs are good fighters without Fury and gain empowered abilities for collecting Fury. It would be useless on Renekton and Tryndamere outside of battle and makes Shyvana too much of a beast.

Mana over time isn't the right direction for Clarity, too. It is a tool that gives you a second wind in a teamfight, but unlike Heal, it needs more preparation, as a dying champ with +40% mana is still a dying champ. For every mana-based champion, 40% is enough to fire a few more spells or a sudden ultimate in a teamfight. That's why Clarity is actually more offensive-oriented in my eyes. Offensive utility, if you prefer.