Caitlyn

Strengths

Make use of her Yordle Snap Traps by placing them pre-emptively to ensure that you'll have one off of cooldown during combat.
Avoid using Ace in the Hole in large team melees as it might be blocked by the wrong target.
Fire 90 Caliber Net away from the opponent to close the gap or hop over walls.

Passive · Headshot — Every few basic attacks, or against a target she has trapped or netted, Caitlyn will fire a headshot dealing bonus damage that scales with her critical strike chance. On trapped or netted targets, Caitlyn's Headshot attack range is doubled.
Q · Piltover Peacemaker — Caitlyn revs up her rifle for 1 second to unleash a penetrating shot that deals physical damage (deals less damage to subsequent targets).
W · Yordle Snap Trap — Caitlyn sets a trap that, when sprung, reveals and immobilizes the enemy champion for 1.5 seconds, granting Caitlyn an empowered Headshot.
E · 90 Caliber Net — Caitlyn fires a heavy net to slow her target. The recoil knocks Caitlyn back.
Ultimate · Ace in the Hole — Caitlyn takes time to line up the perfect shot, dealing massive damage to a single target at a huge range. Enemy champions can intercept the bullet for their ally.

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