Good carry champion for ranked and which champ to buy

I was playing ranked recently and I realized I needed a stronger champion to help me carry my team because lets admit 7/10 games in bronze elo you end up with feeders trolls afkers ect. atm i am thinkingnof getting wither cassiopia jinx or wukong mabye mordekaiser please give opinions on these four but if you have a better champion in mind then please post it in the comments!
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