Skarner

Strengths

Basic attacks apply Quaking. Stick to your target and re-apply it for maximum damage.
Capturing Crystal Spires before attempting neutral objectives or team fights around them improves Skarner's performance in said fights dramatically.
Impale is extremely powerful when you use it to position an enemy so your allies can attack them.

Passive · Threads of Vibration — Skarner's Attacks, Shattered Earth, Upheaval, and Impale, apply Quaking. At max stacks of Quaking, enemies take max Health magic damage over its duration.
Q · Shattered Earth / Upheaval — Skarner rips a boulder from the earth that empowers his attacks and can be thrown as a powerful projectile.
W · Seismic Bastion — Skarner gains a shield and creates an earthquake whose shockwave damages and slows foes.
E · Ixtal's Impact — Skarner charges forward and passes through terrain. If he collides with a champion or large monster, he'll slam them into the next wall he hits to damage and stun them.
Ultimate · Impale — Skarner's tails lash forward to suppress enemy champions. Once suppressed, the victims will be dragged along by Skarner as he moves around.

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