User blog comment:Prolomac/Gaia, the Archon of Mana/@comment-3450702-20120126131454/@comment-3450702-20120130222015

The thing is nobody likes % of mana costs. I have a feeling that people would play this champ COMPLETELY different from what you desired: You wanted a mana-using champion such as Swain, Anivia etc. but they'd just go some regen and build tanky/damage/whatever.

Make her skills scale with max mana, not current, and give her flat costs to really increase people buying mana on her.