I would've said
, but she isn't doing pretty well atm. She still has her good base damages and good burst, but she is dead beat by probably every other mid lane mage. She is still a very fun, and versitile champ to play as it shows in her kit. She is long range and has good poke, but her move speed is just... ugh. But once she locks someone down with her E, her burst from her plants and abilities combined with her ult is phenomenal. She is VERY squishy, probably very close to anivia and sona starting health, her passive isn't great and she doesn't really stand out at late game, but she compensates with her different and unique playstyle by utilizing her W's (they are practically about the same thing as
's turrets, but don't last as long). I'd suggest trying her out at least.
But to compensate, syndra would be a very good choice for you since she has great burst lvl 6 >, has little delay times on her abilities, and is a great lane bully. She has been getting quite the nerfs for her early game, as well as the upcoming removal of DFG, but is a late game killer.