Commonly Used Shaco Skins by Mastery Level

Beginner: They don't have many skins yet, so they just stick with the default skin.

Intermediate: They buy a Legendary skin to start learning him for real. Spamming emotes is the most important part of this skin, but they usually just die before they can even use them properly.

Expert: They realize the backstab (crit) animation on the Legendary skin is actually trash, so they switch to an Epic skin instead.

Veteran: These guys don't give a damn about crit animations. They're straight-up psychos who only play the game to tilt the living hell out of the enemy. Watch out for anyone with Shaco mastery level 25 or higher.