User blog comment:Nuclrdmntr/What is the definition of a troll in League of Legends?/@comment-4131177-20130406170726

Playing a champion in a way that does not allow it to reach it fullest potential by playing it differently than what has commonly proven as the way to achieve this maximum potential, and doing this knowingly (and thereby decreasing the chances of winning for the team knowlingly) is trolling.

Soraka ap could work but:

-She would be a very specific counterpick, and only really excel against specific enemies

-Even if you Pick her correctly, she has scalings that denie her from ever having a lategame impact comparable to other casters who are designed to be AP carry

So playing AP soraka is usually trolling. Doesnt mean you can't pwn with her. but it comes at an avoidable risk.