Syndra

Strengths

To maximize your ultimate's damage use it when there are many spheres on the battlefield.
After you hit an enemy champion with Force of Will follow up with Dark Sphere, they'll be slowed and have a hard time avoiding it.
Get one of your spells to rank 5 as quickly as possible, they gain powerful bonus effects at max rank.

Passive · Transcendent — Syndra collects Splinters of Wrath from gaining levels and damaging enemies which upgrade her abilities. Dark Sphere: Syndra can hold an additional charge Force of Will: Bonus true damage. Scatter the Weak: Increased width and slows all targets Unleashed Power: Executes low health targets
Q · Dark Sphere — Syndra conjures a Dark Sphere dealing magic damage. The sphere remains and can be manipulated by her other powers.
W · Force of Will — Syndra picks up and throws a Dark Sphere or enemy minion dealing magic damage and slowing the Move Speed of enemies.
E · Scatter the Weak — Syndra knocks enemies and Dark Spheres back dealing magic damage. Enemies hit by Dark Spheres become stunned.
Ultimate · Unleashed Power — Syndra bombards an enemy Champion with all of her Dark Spheres.

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