Balancing Jax: Unique passive: Spellblade

Recently I saw a post about Jax being broken and generally the comment section seemed to agree that Jax was a broken champion. However it's difficult to change Jax without gutting him as a playable champion. That's where a small fix to a set of items would perfectly balance Jax. In that post I have a comment about my thoughts, but I would like to make a separate post to discuss just this one change. "I was thinking about this for a while now, and I think I've found the perfect balancing item for Jax. Unique passive, Spellblade. It is used by Sheen, Triforce, Lich bane, and Iceborn Gauntlet. If there was an added effect of Spellblade where only the empowered attack cannot be dodged, then Jax would easily be balanced. There are many toplaners and mages who use Spellblade through Lich Bane or Triforce. Of course, Jax would still be able to dodge ordinary attacks, but if just that one hit every two seconds is guaranteed to hit, then it allows some counterplay where Jax isn't entirely invincible. Champions like Fizz, Ez, Fio, Camille, Dar, GP. etc would be able to still land some damage while not entirely ruining Jax as a champion. Also, this is a very niche change in that it wont affect any champions except for Shen and Jax. Thoughts?"