Suggestion for a CV buff

Summoner's spells are really powerful spells that have a big impact on a game. If you decide to take , that's because you want to counter assassins an ADCs in fights. If you take , that's because you want to be able to ensure a kill in lane. If you take , you want to be able to reposition quickly on the map to threaten the enemy of a split-push, etc.... And is always a must have.

But, there is {{summoner:2}} ...

The only thing CV is better than is that its range is global. But taking has almost no impact on the power of the champion since there already are many and enough wards. But then, why would you forgo extra power by taking CV instead of simply getting ? The global range of CV is not enough to justify the loss of ignite, smite, exhaust, heal, TP or flash.

Clairvoyance is supposed to be the ultimate vision spell, the thing that makes you certain of what is happening right now. So, here is my suggestion: Instead of simply giving the spell a global range, give it a GLOBAL EFFECT: Make CV make the fog of war completely disappear! Of course, the duration and the cooldown should be adjusted but I think that giving the ability to know EVERYTHING that's happening of the rift would be a great buff for CV.