Champion question

Ok so if someone took the time too learn everything about this champion and master it which would be scariest too go against if mastered? Olaf,shen,volibear which of these when mastered would be scariest too go against?
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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