@Stashu SIMPLE Cassiopeia Changes to Please Everyone!
Hey Stashu,
I want to start by saying that 4.21 was a step in the right direction IMO. I really enjoy the updates we have seen for Cass recently. Thanks for taking the time to work with us and great job so far.
The only issue that people feel has not been addressed is her "Poison Mage" playstyle taking a backseat to her APC cabilities.
This suggestion is an improvement upon 4.21 Cass keeping everything she already has.
Suggestion for a simple AND INTERESTING fix:
Give Cass 3 evolution options while only allowing her to keep 2 in one game similar to 
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Noxious Blast Evolved: Now deals 20% more damage as a base and causes a cloud of poison to remain in the area and disperse into a larger area before disappearing after a short duration. Poison amp on E proc nerfed to combat higher base damage: 20% on 1 stack, 30% with 2
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Miasma Evolved: Miasma becomes stickier and grows larger. Champions who get caught in the middle "sweet spot" of Miasma are rooted in place for a short duration.
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Twin Fang Evolved: Twin Fang spell vamp increased (subsequently removed from passive)
These evolution points can be given out at levels 6 and 12 with the upgrade of her ultimate and allows Cassiopeia to evolve differently depending upon what the situation calls for. I'm sure some number adjustments may be in order, but these are just ideas to help the poison fantasy come across without giving her too much of an early game.
Level 6 is the perfect time to add power to Cass. Early game is coming to a close and power levels are beginning to pick up on all champs.
I really think the evolution path is the way to go with this one. It will give every Cass player more options and add to her "poison mage" and APC fantasy.
Thanks again for taking the time to work with the community Stashu.
We are all on the same team, we just forget sometimes.
Get well soon