Clairvoyance
Hi, Yes it wasnt most used summoner spell, but still it was option for game. It was passive spell which means it soent affect gameplay via dmg or another effects. If you remove normal wards from game , it can be good option to look at map and see mopving of enemies or quick control for camp, paths or jungle.
It was good option, maybe not most used but good option. Give back Clairvoyance to game!