I see Trace all of the time, you can see him if he is aiming, if he is stationary, he is invisible. Judicator flushes out the Tracers, I myself use Trace, occasionally I'll play as Noxus or Sylux.
Status: No good today, I'm gonna be on single player mode, attempting to beat game, or face some bots. PM me tomorrow, and I'll try to arrange a match.
Note: I use bots, yes I do. I don't care if its considered cheap, when I get good, I'll be good and proud of it! Unless you exploit 1 life survival matches on Alinos gateway as Spire... Those are cheap. Run into lava with Imperialist in a random corner, snipe away, cheap. Trace is cheap but I like him. Sylux is good for a melee battle