At level one his Q, W and E are all 60 mana. The only mana cost that seems like the best for these three spells is probably his E. If you got maybe 10 mana back from using his 2 passive attacks that would really help him in lane.
He should get a decent refund for proccing it on champions but not minions, since it'd promote interactive laning. Anything would be better than the current state where if you do anything in lane you're left standing there waiting for three minutes until you can do stuff again. I even have a dedicated mana regen rune set up for Taric that's sub-optimal just so I don't feel punished for using skills in lane.
Fighter Taric is dead, mainly cause his spam ability cost 140 manas for a pitiful amount of heal. Cost for Q should be calculated through number of stack.
Hi, I'm in the top 1000 taric players in the world (or at least was, think I lost that after i got demoted) and I just want to bring some stuff to your attention. Taric is not an early game support, he is not supposed to have an easy lane phase. Think of him like the swain of bot lane, Get past the early game and you become a huge impact in the teamfight phase.
Key items you get will help you as well, 
does wonders for his kit, and makes any stun you lane a kill at least 70% of the time. An off meta solution to his mana problems would be to build 
, which is how I got a high winrate on taric in the first place. When you get to your second item, its either gonna be 
or 
. In my experience, I find to be the better of the 2 items. Sure is supposed to be better, but I have won FAR more games with just because of how strong the passive is. the flat ~30 damage is ok, but the fact that your allies regen that ~30 damage is amazing, and is almost a must have if you've got both a attack speed reliant adc and a yi jg or something. Don't underestimate this item just because people say redemption is better
But yeah, Taric would be too strong as a champion if his lane phase was any better, he is supposed to be a late game carry support.
Taric has always has this "mana trap" in his kit. Spam spells untill you run out of mana, then be useless untill you have a bunch of it back.
is a core item on him for a reason.
My theory is that mana problems only arise when abilities are unhealthy to use regularly in lane, which is why they end up being gated so harshly that activating them in appropriate situations drains you too quickly. It's clear that Taric's Q is a major pain point in his kit, as its heal has been lowered so that its 45-second, 3-charge heal has a lower base value than a single Soraka W, all while having a mana cost so high that it can only be balanced around its 3-charge activation, as sinking 140 mana into a "spammable" heal will do nothing but drain him extremely fast.
Right now, I think the main issue with Taric is that he's supposed to follow up any action with an enhanced auto, but that doesn't feel impactful enough for him to go all-in in most cases. Having him refund mana with Bravado could help push him towards a much more interactive pattern, but in the end that part of his kit doesn't quite mesh well, as he still mostly just hangs back and only goes in when he lands a stun.
While manaless fighters tend to be unpopular due to how they feel like they "cheat" on resource management, I think Taric, along with supports as a class, could afford to be manaless: unlike solo-focused champions, who don't really have anything to manage but themselves, supports already have at least one ally to watch over, so they don't need resource management on top of that as an extra gate, particularly since their itemization ends up turning them into pseudo-manaless, spammy casters anyway. He might need changes to his Q to be healthy as a manaless champion, but otherwise I think removing his mana gates and putting extra emphasis on proccing his innate would benefit him immensely.
