Qiyana vs Cho'Gath

Pick your Terrashape (W) element for the job: river for an Ice root, terrain for Rock's bonus damage on low-health targets, brush for Wild's invisibility.

Cast Terrashape (W) right after Elemental Wrath (Q): the dash resets its cooldown, so you can recast it in the same combo.

Cast Supreme Display of Talent (R) toward a wall near the enemies: the explosion runs along the whole edge of the obstacle, and any river or brush it crosses explodes too.

Roam with Wild, the brush element: Elemental Wrath (Q) then leaves a trail that makes you invisible and speeds you up.

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.