Anivia is a strong control mage. She is good mid game and extremely good late game. She has amazing wave clear, 1v1 and teamfight presence. She outscales many midlaners, and her passive allows her to survive through a teamfight. Combined with zhonyas and seraphs shield, she is very hard to take down. Only thing to remember is that her E does more damage if the target is stunned or slowed, so try to hit your Q or R before doing your E. You can block their path with W, hit q then ult then E.