Diamond Eve Main here with 600+ Eve games: Do not nerf Eve this way

Hello! My name is Brian and I'm a diamond Eve main with over 600 Eve games in ranked this season alone, and I've been playing her for quite a while so I've seen plenty of her ups and downs in terms of nerfs, and I have to say this is probably one of the worst ones you've considered in my opinion.

For all of those unaware this nerf is basically just adding 40 mana cost to her W, and while you might be thinking "that's all? that's nothing!" I don't blame you for thinking that but it isn't quite the case. See when you look closer at this ability it has 2 reset mechanics, one on kill and one through amount of targets hit through spells. In fights you can easily use this spell 5+ times in big teamfights, it's her bread and butter fight mobility spell and what allows her to function as an assassin.

Now say you do use this spell 5 times in a given teamfight, you essentially are using up 200 extra mana, on top of your rather high Q costs (36 at rank 5, which you spam a lot in fights), 70 mana cost on E and of course 100 on ult.

Let's compare this to another sustained damage assassin who uses a resetting ability and mana...

Kha'zix! This is not to say Kha'Zix is strong or anything, just an a fluidity argument.

Now Kha has a resetting mobility dash that's on his evolved E, and at all levels this costs 50 mana. While the cost is higher than Evelynn's the distance granted is far higher and it also offers damage, he will also typically use it less per skirmish. Also when you look at his other abilities he has much lower mana costs on his sustained damage ability. His Q, which is his sustained damage ability costs only 25 mana at all ranks, and his W which is his secondary damage ability costs 75 at max rank. As you can see his mana costs in a prolonged fight will end up being overall lower which helps keep fluidity in his kit, and won't feel bad to play in prolonged skirmishes.

Again this is not suggesting Kha is good at all, this is a feeling thing.

Now for Eve if you want to add this cost to her W to add more risk or to slow her jungle speed that's fine, but you need to reduce the cost of her Q or E to make up for it so you can keep her skirmishing from feeling terrible.

In my opinion however it would be much better to simply revert a buff you gave her not too long ago, namely the massive slow you gave on her ult so her level 6 ganks are not nearly as impactful as they are now.