User blog comment:Big Lupu/Why do wards take slots?/@comment-4652200-20130608202353/@comment-4022742-20130608225110

Exhaust still has use if there is no gank. In a teamfight you have an actual fighting summoner, instead of seeing what you allready can.

I love taking clairvoyance, but it's a pure early/mid game summoner spell... sadly.