Sylas

Strengths

Wait for you or your enemy to reach low health before using Kingslayer for maximum effect.
Space out your ability usage to get maximum effect from Petricite Burst.
Clever use of enemy ultimates can open up new possibilities to approach teamfights.

Passive · Petricite Burst — After casting a spell, Sylas stores a charge of Petricite Burst. Sylas's basic attacks will expend a charge and whirl his energized chains around him dealing bonus magic damage to enemies hit. While Sylas has a charge of Petricite Burst, he gains attack speed.
Q · Chain Lash — Sylas lashes his chains out, intersecting at his targeted location dealing damage to and slowing enemies. After a delay, magical energy explodes from the intersection point dealing damage.
W · Kingslayer — Sylas lunges at an enemy with magical force dealing damage and healing himself against enemy champions.
E · Abscond / Abduct — Sylas dashes to a location. Sylas can recast the ability to throw his chains out, pulling himself to an enemy he hits.
Ultimate · Hijack — Sylas steals the enemy's ultimate ability and can cast it freely.

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