Cassiopeia; A suggestion taken from the "Cassiopeia Plans" topic

Since the Cassiopeia Topic has become a real chaos again due to the large amount of responses, I'ld like to discuss a certain suggestion here. It's a suggestion to change Cassiopeia's passive to be more poison-ish as well as adding an AP-carry aspect lategame:

Stacks are removed, instead bonuses are gained by leveling up. This way you might fall behind, but don't become useless at all (as it tends to happen with her new passive)

Level 3: Poiston reduces healing effects by 35%. Level 5: Poison reduces the enemy's magic resist by 10. Level 7: Poison slows the enemy by 5% Level 9: Poison reduces attack damage by 10% Level 11: Poison reduces magic resist by 10% Level 13: Poison reduces armor by 20. Level 15: Poison reduces attack damage by 20. Level 17: The slow is increased to 10%. Level 18: Poison ignores 25% magic resist.