Jax needs a slight compensation buff after 9.12 corrupting pot nerfs
After the 9.2 base AD and q damage nerf, that was enough to weaken his early game and give opponents a chance to shut him down early game. Corrupting pot and time warp tonic was the only thing keeping his early game in-tact and now after the nerfs its very hard to win lane as jax and if the enemy opponent is good they can deny you a bunch of CS. His win-rate dropped to below 50% in patch 9.14.... there's no reason not to slightly buff his base stats in order to be viable in lane.
completion and keeps scaling til level 18 and max build. Weak early, reasonably strong spike midgame with triforce, and Very strong late @ 3+ items.