I think I have an idea for a decent nerf to Irelia.
Move the extra damage to minions that Bladesurge has to her passive.
This will make it to where Irelia can't use that extra damage to consistently dash around the lane, nor will she be able to use it to proc her passive.
However, once her passive is proc'd, it gives her a pretty strong window of power that both her and her opponents can play around.
And since this damage isn't something she has all of the time, you could actually increase the damage dealt to minions, that way she is guaranteed to get off those resets during her passive.
It adds skill expression, it adds counterplay, all while actually adding damage to her kit (albeit, just to minions).
What do you think?
is a core buy for her.
has a base AD of 111 give or take while that goes up as divers get more bursty, up to 136 I believe for 
being one of if not the most burst heavy Diver. Irelia's base AD is very close to Wukong's at 130+ (they may be the only two Divers with 130+ base AD but don't quote me on that), even though she has quite a bit of sustain damage in her kit. Just putting that out there, might be worth trying to lower her base AD and see what that does.
