User blog comment:Derpinator Power/Rarely Played Champions/@comment-5077844-20140806141030

Anivia is really not that hard...Basically you get a RoA (+ tear if needed) and one shot squishies midgame. Her early is stronger than most people think, her passive gives her invisible power since it prevents all-ins. You can eaisly get kills from enemy ganks and you siege everything with your ult.

The only reason she isn't played is her low mobility.

Cassiopeia isn't difficult either, but all of her counters are basically standard midlaners. Also, no escape apart from Q and early farming is a pain in the ass...