User blog comment:TheTobarMethod/Nerf Worthy Champs + Your Thoughts/@comment-4530717-20130705145116/@comment-8506165-20130712203042

Shaco's hard counter is vision. His stealth is a short-range blink with a short duration afterwards, but if you've good enough wards, even Sight Wards will ruin his element of surprise. On bot lane? Stick a ward at Drake early, he'll generally never stealth until before he hits river brush because he'll expect the ward to be there. Top lane? Ward the entrance to blue's Ancient Golem (or at Baron but entrance to blue jungle is more useful) and the tribrush, 9 times out of ten you'll see him before he stealths. Midlane is hardest, but put a vision ward in the middle of the lane and his stealth's virtually useless if you're around there because you'll see him before he Backstab-crits you. And lategame your support should be warding everywhere they can, Shaco finds it hard to surprise people when they see him wandering through the jungle towards them. :P

(As a Shaco player I'll hate myself if this comes back to bite me in the ass, but hey.)