PLEASE READ BEFORE COMMENTING!!!
(I added a TLDR in the comments if you just want the change ideas without the reasoning for them though)
I've always wanted for Bel'Veth to have direct stack scalings, so she is more like other infinite scalers instead of just stacking attack speed (which in large part just makes up for her not getting attack speed with level). A midscope would be the perfect time to add that.
A big complaint of Bel'Veth is that she doesn't fulfill her fantasy (both before the midscope AND after people still think she doesn't really fit), and while I almost entirely disagree with that sentiment, I think a lot of it comes from her stacks being attack speed and nothing else. Every other infinite scaler in the game (aside from Bard who is debateable. Swain and Sion don't count IMO) has direct stack scalings, even the ones who directly gain stats from their stacks (Thresh and Senna's stacks are almost entirely about the stats they give, but they still have direct stack scalings on their abilities), so why should Bel'Veth be different?
Reduce her base damages, and give her not overwhelming but nonetheless impactful stack scalings. Specifically W and R. Q and E don't need stack scalings, as they already benefit from the attack speed the stacks give. W and R not only don't benefit from the attack speed, but actively work agaisnt it with their cast times.
So this is what I mean by giving them stack scalings:
W: Damage from 80 to 320 gaining 60 damage per level, to 60 to 220 gaining 40 per level (still missing the bAD scaling the midscope took away). This would come out to a total 100 damage nerf at max rank. The W would gain a 100% stack scaling, so each stack increases the W damage by 1. This would mean the damage is the same with W at max rank at 100 stacks. So the damage is less at max W rank if you have less than 100 stacks, and more if you have more. While the W damage is slightly higher throughout the game before you put points into W.
Basically, the W's base damage would be how it is pre midscope, but with the bAD ratio still removed yet made up for by a 100% stack scaling.
Bel'Veth is almost never going to get siginifcantly more than 100 stacks in a game, so this wouldn't make her W do very much more damage at max, what it would moreso serve to do is make it's damage scale more consistently throughout the match. If you are maxing W last (which I think it should be a choice whether to max W or E second, not just max E second everygame), the insane 60 base damage per level with no AD scaling just makes it's damage way too lopsided. It goes from 80 damage all game (unless you are building AP which most players in most games won't) to 320 way too fast and way too suddenly. The ability already gains a lot of power from putting levels into with the knockup duration, it doesn't need insane damage per level too. If they are dedicated to keeping the AD ratio gone, less base damage growth with stack scaling would not only make the ability's damage more consistent throughout the game, but it would help her fulfill her stacking fantasy. Even if the damage is basically the same maybe very slightly higher with the stack scaling, it would feel way better and way more like you are stacking up.
R: Damage from 150 to 250, gaining 50 per level, to 85 to 155, gaining 35 per level. It would gain a 200% stack scaling (this is exclusively for the flat damage, not the missing health damage). All the same benefits as the W getting a stack scaling. This would be an overall slight buff to the R damage, so maybe the base would have to be lower, or maybe 200% is too much.
How Q and E could scale with stacks so every active ability does:
Q: Dash speed: 850 --> 800 + 200% stacks (so the dash cast time is reduced with stacks, the distance remains the same. I honestly don't know why it wasn't like this in the first place)
E: Range: 500 --> 450 + 100% stacks (so even at 50 stacks, 10% increase at 100)
Making Q and E deal damage with stacks wouldn't be the best idea as they already effectively do with Q lowering the cooldown and E getting more attacks (though I don't think a stack ratio on Q damage would be a bad idea, I think the dash speed would be better). The Q dash speed increasing with stacks would help greatly with the feel of the champion. Higher dash speed means less time spent in the dash, which means more time you can be basic attacking making use of the attack speed you have. With enough stacks, you could really feel like Bel'Veth in her cinematic, where her dash is almost instant. The ability just feels so much better with higher dash speed. E range is just sorta a no brainer, except maybe the numbers I have would be OP (though I doubt it. I don't see how a 10% nerf to it's range at 0 stacks and a 10% buff at 100 would be too good, if anything more of a nerf).
Less practical ideas:
R on-hit: The R on hit already scales with the stacks as it is an on hit which gets applied more with attack speed, but still, a very small stack scaling would do wonders not only for the fantasy of it but the balance of the champion. Damage from 2 to 6 gaining 2 per level, to 2 to 4 gaining 1 per level. A considerable nerf, but it would gain a 3% stack scaling (gaining 1 damage every 33 stacks, so 3 more damage at 100 stacks). This would be very minor, but would still have all the same benefits as the other two stack scalings. Besides, if anything that already benefited from the stacks should have a stack scaling, it should be the R on hit.
Passive: I hate how the midscope makes the passive attack speed after ability 20% flat with no scaling. So what if it scaled with stacks? This might seem counter intuitive, but hear me out.
Reduce the stacks efficiency from .1% to 2% (growth = .05-.15) to .07 to 1.6% (growth = .09) scaling with level, but make the attack speed after ability cast gain .4% per stack regardless of level. And make the passive give 15% flat instead of 20%. So a nerf to the super early, decent buff to the mid game, and very minor buff to the late game.
What this would mean, is that the stacks are slightly less effective without the passive, but slightly more effective with the passive. It would make stacks worth more early, so it doesn't feel like they don't do anything until later into the game, and it would make the attack speed after cast feel less useless past the first clear. So without making the stacks scale in value faster or be worth more early, they would indirectly be worth more early, with their value more consistent throughout the game instead of being almost valueless early and incredible late.
If .4% flat would be too much early, it could be .1%-.44%, gaining .02% per level. Still better early without being too OP. OR, it could just be .2% at all levels, with the stacks being worth .1% to 1.8%. Again, a buff to the early game stack value and making their value more consistent throughout the game at the cost of having a portion of the stacks value locked behind the attack speed after cast.
Or it could just be a flat out buff and have each stack increase the passive attack speed by .1% with the stack value unchanged. A very minor buff (10% more attack speed only after cast at 100 stacks), but again, this is mainly to make the ability feel better and the chanpion feel more like a stacker.
Again, this would not only make the champion feel more like a scaler/stacker, but make her power more consistent throughout the match, instead of being like pre midscope where it's too good early, or post midscope where it's all about late. She would both be more of a late game scaler, without being auto win condition late game.
Is this reasonable? I ask this as a genuine question. Is this something you guys would want? Do you think it would make more people play the champion? Do you think it would be balanced (or at least able to be balanced with tweaks)?
My answer to all of those is yes, what are yours?