Sivir nerfs are way heavy handed.
The issue is that Riot is tearing down the champion by doing two things at once.
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Upping her spellshield CD considerably. I understand this as she's got long ranged waveclear and a MS bonus and she's deceptively safe in fights. But at least she isn't too dependent on the spellshield for ma...
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Lowered her mana regen. The issue is that by doing both concurrently, you put her in an awkward spot where you nerf her safety because of her waveclear, and you nerf her waveclear because of her safety.
It ultimately hurts the champion far more than just the spellshield CD and the AD nerf, which I do support because with 30% CDR on it holy shit that champion is safe. That or the AD nerf + mana regen nerf, but all three at once, again, are overkill.