Decrease* Diana W CD? Ty BL
it actually Haas a really high mana cost early game if you max it and your shield is the only thing that makes pulling three people in with her e without zhonyas or f a optimal idea. you increase the chance of hitting her skill shot when you increased its e range but this disruption affect comes at the cost of her position in a team fight, making it a very risky decision that relies on your teams ability to aim there skill shots at DIANA. which, granted is very predictable affect a large enough area to be great in skirmishes but suicide in a team fight. you pull from every angle if your a good Diana so you can pop your shield instantly. i would say this would make her optimal pick since currently lee sin seems like a much better assassin disruptor.
R.I.P. Lunars

Edit:Dianas e has a really long cd making it even more predictable forgot to mention ;) 2:also she has so many different ways to proc w so players who are willing to maintain mana control are the ones that will play better with this change. if she could use it twice then it could give her more opportunities to use her ult safely. since she can only dash to 2/3 vs 3/3 with lee sin