Skarner vs Cho'Gath

Cast Shattered Earth (Q) before the fight: your next 3 autos gain attack speed, and the last one slows and deals bonus damage based on the target's max health.

Gank with Ixtal's Impact (E) through walls: you drag the first champion you hit to the end of the charge, and if they hit a wall, they're stunned.

Cast Seismic Bastion (W) as you get into melee range: you gain a shield, and the earthquake damages and slows nearby enemies.

Cast Impale (R) on their carry and drag them toward your team: you suppress up to 3 champions hit and drag them with you.

Keep moving against him: Rupture (Q) strikes an area on the ground, and an enemy standing still takes a knock-up, damage and a slow.

Punish him when he goes for last hits: Carnivore (passive) restores health and mana for each unit he kills, and he lasts a long time in lane if you let him farm.

If you have range, keep your distance: his kit has no dash, only the slows from Rupture (Q) and Vorpal Spikes (E).

Don't stay in melee range at low health when Feast (R) is up: its true damage ignores your resistances, even if you're a tank.