User blog comment:Elphrihaim/Clarivoyance...?/@comment-1985493-20130806173415/@comment-4434378-20130807025227

Its really more of a fall back spell. CV allows you to still have some baron control even if you are pushed to your base while the enemy has Oracles.

The problem is that in lane, you are pretty much guaranteed to lose as the enemy has more fighting summoners. Its hard for a support to translate the extra security from junglers into more power in trades. Though it can be nice for shutting down ganking junglers if you know their Route (Alistar, Maokai, Xin)