Swain deserves a better passive or a buff.
I don't think, we will ever see him as a mid pick. Impossible to trade early mid game without dying. Huge mana costs, forced to do a mana build. (Rod of Ages) Flask 2 rings? Mana regen runes? (All underused while other champs don't need them)
When I see a swain player, I also notice they can never farm properly. Not sure if this is due to his base attack damage, or his kit is just hard to last hit / trade and survive the lane lol.
I suggest a better passive, or buff up his Nevermove. (funny name lol)
Possible passive buff would be mana regen on kill assist, or more mana regen when he has lower health / mana.
If nevermove was buffed, it would have to be a damage / ratio / size increase, with a longer delay for the root to take place. This way Swain can wave clear properly, and we don't have to see the awkward bird man toggle for 3 crows to last hit for him lol
(I can actually see swain being more viable now, since one of the niche annoyances as a swain player - was that if you were silenced you can't turn off Ult) But no one can silence you now except for Soraka lol XD