One Reason to Buy Anivia
If your teamates are being toxic, troll, etc... (ONLY FOR THESE REASONS! DO NOT ABUSE) ice wall them into dragon or baron pit. Keep them there until they are done (wprks best if they are playing an immobile champ). When they stop, let them free. If not, keep them in prison. Only do this if this person is annoying your entire team, don't do it to troll someone actually doing their job.