Hello! The item should work, but it's not a popular choice for Kayle. Perhaps the most of Kayle players think Shadowflame is not worth it to replace any other standard Kayle's item in her build. Shadowflame suits better for mages with burst type of damage, who try to one shot their target.

Hello, Brad! You can punish Kayle early on as Jax by jumping on her and stun her every time she tries to last hit a minion by her AA or E which have lower range than Jax's jump range. Put ward on the river so you would see enemy jungler and overall it's good to watch mini-map all the time since you have lane priority and you are able to help your jungler to dominate over top side of the jungle. You can call your jungler for Rift Herald and you can take it for free quite often if your mid laner is OK and you can potentially kill Herald as 3 champs. Another good option to destroy Kayle is to stack about 2 minion waves and then dive Kayle under her tower if she is low on health. You can dive her alone or with your jungler. Even if you kill her and die as well it's good for you since Kayle would lose gold and exp for 2 minion waves which is huge. I recomend you to watch lots of Jax vs Kayle replays that you can find by using that link: https://www.leagueofgraphs.com/replays/all/jax/vs-kayle

Good luck! :)

Thanks! 😊

😊

Okay, thank you! :)

Thank you, Lupenor! 😊

Thank you, Rembrancer! 😊

Only if you want to play super agressively and try to kill him at level 1 with the rune Press the Attack. Overall you can buy Oblivion Orb\Morellonomicon (for AP build) or Executioner\Mortal Reminder (for AD build) to decrease his and other's healings

Thank you, Cornifa! :)

Hello, XayLies! Thanks a lot! :)
I will try to improve this guide in near future (maybe some design improvements + more match up videos and information. Thanks for a nice comment, it inspires :)