For a champion designed around having to cast A LOT of spells to effect the game, she sure has high relative mana costs. Or i suppose another way to look at it would be that everyone else has much lower costs for much more impactful spells. They don't need to be so low that it's impossible to punish her, but i really shouldn't need mana flow band + 2-3 mana regen items to keep from running OOM every 20-30 seconds.
its ok theyre increasing all her mana costs by 30 next patch
build this and you will never have to worry about mana again and you can 1 shot everyone too.
I'm fine with it, mainly because
a) late game, mana isn't an issue at all b) I'd rather her be flying under the radar than be played as APC bot lane so she gets swiftly gutted because she's an old champ without "LCS Big Plays"
Supports build 3+ mana regen items anyways. Sona's abilities are constantly off cooldown. Sure they're low impact, but they're good enough to work, making her infinitely able to cast would be a bad thing. She has to have some sort of weakness for her Q poke as well.
They actually plan on buffing her Mana costs when she tags someone. If she builds 
/ , then her costs are significantly decreased.
Sona needs a Q rework.
An auto aim lock on ability that out ranges auto attacks with constant nerfs to her base health puts her at a strange spot.
