Cassiopeia passive idea

Since riot wants to dump all of cassiopeia's power into her e why not make a new passive to help her switch targets more fluidly:

NEW Passive: Poison Snakes Cassiopiea stores charges (up to X) which cause her basic attacks against champions to poison them for X seconds dealing X damage per second and consume a charge.

This would help cassiopeia switch targets more easily during teamfights and make it easier for her to poison targets that she's having trouble hitting with Q or W)

(Alternative: Twin Fang stores charges and can have it's cooldown refreshed on targets that aren't poisoned by consuming a charge. Charges are not consumed on poisoned enemies. This version would make it so that it's harder to waste a charge. You could also have the charges just poison the target like the first passive. There's a lot of flexeblity here)

This new passive would also make the % poison damage boost on twin fang work better because you could use e twice first with cooldown refresh and then use poisons benefitting from the boost.

Post any different ideas that you may have if you don't like mine ^_^