Champion: Kayle // Ability Change: Intervention
Greetings fellow summoners,
Hello, I am Recons, a lowly Silver 1 player, posting this thread to bring some visibility to an issue and hopefully gain some insight.
For the past few months I have been keeping track of champion win statistics and Kayle has been topping the charts, with the highest win percentage for quite some time. After some pondering, I came to the conclusion that her ultimate ability, although very much so part of her identity, needs some tweaking. Here are my two problems with Kayle's ability:
Intervention - Cost 0 RANGE: 900 COOLDOWN: 100 / 90 / 80
ACTIVE: Kayle bathes the target allied champion or herself in holy light, rendering them immune to all damage for a few seconds.
DURATION: 2 / 2.5 / 3
Intervention is a self- and ally-targeted buff.
Intervention has no cast time and does not interrupt Kayle's previous orders.
The first problem, Intervention has** NO COST **, that's right, no cost similar abilities like
Chronobreak, or
Cosmic Radiance have a mana cost of 100.
Second, her ability has NO CAST TIME or delay whatsoever, it won't even cancel her previous orders. Unlike 
who have an animation/delay which allows you to position yourself properly and/or disengage to wait out the ability.
I feel like the ability needs some sort of delay and cost, like other abilities of its type, this will increase the amount of counterplay and skill necessary to exploit this champion's strengths. My suggested change would be the addition of a mana cost, a .5 second delay, in which it is visible that Kayle is preparing this ability, and perhaps making the duration flat 3 seconds to counter-balance the nerf.
Although I understand that Kayle's kit is not very impressive without this ability, there is a reason why the champion has a 55% win percentage in Solo Queue. What do you guys think? Any Kayle mains have some insight on this, or perhaps any suggestions for a change?