All depends in what type of reaction works best for you. Seeing you have a mutant cell that would tend to believe you like a mid lane strong break point ball on fresh. When they break down the logical choice to get thru heads which is why you cant use mutant anymore in my opinion would be a reign and still would give you the back end reaction you are looking for. If you like a mix of midlane and back end go with cell pearl. Onyx vibe is a control/arc piece which is great if this reaction suits your style,its all what you think works best for you. They are all good balls in their own right, hope this helps make your decision.
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Back on the left side of the lane trying to hammer out my game.