Shaco

Strengths

Using Deceive over terrain can help you make a clean escape.
Try getting items with on-hit effects. These will also benefit your Hallucination clone.
Backstab's damage can be increased with increased Critical Damage effects like Infinity Edge.

Passive · Backstab — Shaco's basic attacks and Two-Shiv Poison deal additional damage when striking from behind.
Q · Deceive — Shaco becomes Invisible and teleports to target location. His first attack while Invisible is empowered, dealing bonus damage and critically striking if he attacks from behind.
W · Jack In The Box — Shaco creates a hidden animated Jack-in-the-Box. When triggered, it will fear and attack nearby enemies.
E · Two-Shiv Poison — Shaco's Shivs passively poison targets on hit, slowing their Move Speed. He can throw his Shivs to deal damage and poison the target. The thrown Shiv deals bonus damage if the target is below 30% health.
Ultimate · Hallucinate — Shaco creates an illusion of himself near him, which can attack nearby enemies (Deals reduced damage to turrets). Upon death, it explodes, spawning three mini Jack in the Boxes and dealing damage to nearby enemies.

A suggested 5-lane lineup built around Shaco, based on hero partnerships and role synergy — not win rate.