User blog comment:Emptylord/Custom Champion - Charlette the Oncoming Swarm/@comment-220.239.246.116-20121016103936/@comment-3974211-20121016215303

Zyra, Teemo, Shaco, Maokai, etc, can all place free wards too. Many champions like Lux can also provide sight with a ward-like object.

Clairvoyance was only nerfed because it was global. There is nothing overpowered about having an ability that gives sight.