I'm going with Syndra. I've been playing her in one or two matches and I've been hearing really bad things, mainly due to her single target R, but her Q is so goddamn devastating and on such a low CD that Q + W + Q + E + R + Q is entirely possible. And that shit hurts. My last game with her, I was going streak after streak, but the team wasn't tanky enough and engages were off (nunu ulted Taric like 5 times). Still was a fun game tho.