Vayne clearly needs a buff. Right now she's forced to build a bunch of nonsense on hit items to compete in the meta. Well, why don't we just go full blown on hit? My recommendation? Let W stack on multiple targets, and allow it to synergize with Runaan's. Badabing, Badaboom. Problem solved. Now she will be right at the thresh hold. Just powerful enough to put salt in eyes, but not powerful enough to nerf.
Thank you for your consideration. I trust that your ability to reason will see that I am not only right, but motivate you to implement this immediately.
Have a great weekend.