Twitch change
I feel twitch needs to be like kalista, where their e resets after a kill. After twitch uses contiminate, all he has is basic attacks (but it is op af. I feel this change needs to happen:
IF contaminate kills a unit (minions, champions etc.) the cooldown is reset. BUT next time you use it in a say 20 second time span, to use the ability again costs more mana. This makes it so that now you have to be a bit more concerned to make sure your E kills someone in order to get the reset.