Shaco

Q (Deceive) makes you invisible and teleports you — use it for surprise ganks from behind the enemy.

Boxes (W) have a fear — place them in escape paths or entrances to trap enemies.

R (Hallucinate) creates a controllable clone — use it to trick enemies and force them to waste their abilities.

The passive deals bonus damage from behind — always approach from behind for maximum burst.

Buy control wards: Shaco's Q makes him invisible, control wards reveal him.

His clone (R) doesn't have the same items — hover over it to check, or wait for it to explode to identify the real one.

Boxes have an activation delay — if you hear the sound, Flash or dash immediately.

Ward deep: Shaco's ganks come from unusual angles thanks to his Q. Vision neutralizes him.