I guess Jungle Soraka/Karthus/Cassie for me. I guess. I also really like Sejauni but she's super awful. (Her abilities outside R are just all weak. Like she feels like a bad Amumu/Shyvana hybrid who didn't take good parts of either.
Altho I tend to win with Jungle Soraka. It's not actually that weak unless the other jungler prevents you from getting farmed up. She clears really fast and her dueling potential is pretty good. Also Jungle Shaco is super free for her.
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Whatever...