User blog comment:CapitanParu/Shira, Nobility's Sacred/@comment-7843294-20130624205706

Passive seems like it could be inconvinient at times, someone could drop your mana quiet easily just by auto attacking you, and the restoration from your other abilities isn't reliable enough to make up for it. Same promblem with the ult, maybye have it restore a flat amount of mana as well to help compensate for the enormous cost. To keep mana problems at a minimum why not have diamond wings have a passive that made her attacks restore mana, and on activation it has the current effect with reduced damage and improved mana regen.