A Word about Cassiopeia
I'm gonna get a lot of flack here, but this is just my opinion so far.
She feels better. Not perfect, but better. I feel like that her mana issues have been resolved, and her ability to chase (seriously, slowing and gaining a movement speed buff) really does feel great. Gunning E feels rewarding, but when I do press it felt as though I wasn't directly doing damage. Sure, the E did hurt, but it was the poison buffs (which are passive) that you get from it that do the damage. I'm not too sure I like that damage is coming passively from a mechanic that should be used from this snake mage or else she doesn't work at all. If you aren't poisoning and then hitting E like a madman and then re-poisoning, then you're not doing it right.
I really don't know where I'm getting at with this, except for the fact that she is better. She's nowhere near perfect, however is now playable. This is a good step towards her recovery as a truly fun snake mage champion. Keep working on it; you're on the right track. :)