i strongly disagree with the use of crit in jax, he hardly benefits form infinity and the crit chance mastery his ult does not use crit and it an enormous amount of his damage, not to mention jax is hardly able to be aggressive in game without any health suggest perhaps tabai the mallet then malady followed by rageblade/last whisper depending on the situation and enemy heroes you are encoutering. blood razors are hardly a useful item for jax imo, no offense i just think this build could use some work think personally about jax's combat mechanics

i strongly disagree with the use of crit in jax, he hardly benefits form infinity and the crit chance mastery his ult does not use crit and it an enormous amount of his damage, not to mention jax is hardly able to be aggressive in game without any health suggest perhaps tabai the mallet then malady followed by rageblade/last whisper depending on the situation and enemy heroes you are encoutering. blood razors are hardly a useful item for jax imo, no offense i just think this build could use some work think personally about jax's combat mechanics

i would get relentless assault at 11 and 16. Also, if i go ap i get
1 counter
2 leap
3 counter
4 empower
5 counter
6 ulti
and then max out counter, followed by leap, and finally empower. Also, obviously get your ulti whenever you can. AP jax is truely amazing. With just my normal attacks i was able to do about 600 per second (reg attack + dps from ulti)

As for attack jax, those items are not bad.
Great job with the masteries, thats similar to what mine are when i play him.
I can normally get 40-50% dodge, and with nimbleness, i have almost a constant 10% ms bonus.
Only thing i suggest is take 2 points out of Alacrity for 1 more point in cd reduction and 1 more point in magic pen. Also, if you feel like it will help, take another point out of alacrity for the improved ignite, i would suggest it because that 1-3% attack speed really is nothing. BTW the reason you want that mastery in magic pen, is because 3/4 of your skills deal magic damage and it will help more than that 1-3% attack speed.