It's like having WW's E without needing to have the enemy below half health. The upgraded red trinket is also awesome, as prevents Shaco from using Q to do a full turn while running away. The ideal "Fuck you, Shaco" combo is:
Shaco presses Q, you use your trinket, basicly limiting him to 180 degrees of scape route, instead of a full 360. If he tried to do the usual juke of Q'ing in your direction to run away, the trinket will show him.
If not, keep running in the same direction you were, count to 3, which is the duration of the stealth and use the ghosts. He should be only one flash further than he was before, and the ghosts will slow him down enough for you to possibly catch up.
Shacos usually build either max cdr or none at all, so you either have 6.6 seconds to catch him, or 11 before his Q is back up.
If he build
, abuse the fact that he needs to be out of combatfor 5 seconds for them to proc. On top of the 40% slow of the ghosts, they will also put Shaco in combat for the duration of the slow plus 5 seconds, taking away a flat 90 mov speed (it is actually more, as Shaco's tend to build at least one item that gives them mov speed
). So he's basicly screwed.