@Meddler : Are we ever going to improve or remove Clairvoyance?
Hands down, worst spell. Even Clarity has its place (though not a competitive one). Clairvoyance was already useless before the Scrying Orb was introduced.
If I had to make a guess, I'd say you guys are just going to remove it like you did with Revive, rather than rework or buff it. However, it could become a Support staple to rival Exhaust if you're willing.
It's pretty easy to think up some buffs and reworks for it, so let's do that. I'll begin;
Clairvoyance change 1 Sight radius scales with level. At level 9, also reveals and destroys 1 Ward of any type (does not reveal others or block their sight).
Clairvoyance change 2 Replaces the Scout Mastery in the Utility tree (do with it what you will). Passively increases the placement of both Trinkets and Sightstone wards. On activation, your next Sight Ward gains True Vision for its duration.
Clairvoyance change 3 Instead of revealing a small area of the map, it now summons a Will-o'-the-Wisp which travels to the targeted area and sits there for 30 seconds. Any enemies that come close are chased by it and reduce its remaining time (like a Kalista Sentry and the Wolf Smite spirit).
Come up with your own ideas below! Doesn't have to be balanced, just keep the theme of vision control :3