Cassiopeia- You really cr*pped the bad on this one riot.
You have 100% ruined Cass, the twin fangs nerf literately took away 65% of her dps, the changes to her W are shit as well. But this champ could have survived with the new W that does not correctly land on its hit box. HOWEVER the changes to "E" her fangs are more then overkill no one cares if the CD is not relent on her poisons 50% of her ability's poison. If bads where complaining it was hard to use to bad. You need to fix this champ and fire who ever was in-charge of the rework because A they had no idea what they where doing or B. where biased. I'm personally disgusted that no one on your testing team brought up how bad you screwed this up.
I'm sure some riot white knights will post in defense of this because they have never and will never be good on Cass and can provide nothing insightful to the discussion.