After the Cassio update...
...I don't have a place in LoL anymore.
Not saying that she is completely bad now but she is not the champion that I loved, she is not "my" Cassiopeia anymore.
She is too different, not just from her playstyle but the way she feels is nothing like the old Cassiopeia. The new one is soft and mellow, lacking the aggressive edgy feel of the old Cassio that would give you an adrenaline rush every time you entered into a fight.
if I were you, her passive (and Q MS boost) give her above average MS to synergise with the Ludens :P
You also use A LOT of spells to stack it quickly