Shaco vs Cho'Gath

Gank with Deceive (Q) and come in behind your target: Backstab (passive) empowers hits from behind, and your first invisible auto becomes a critical strike.

Save Two-Shiv Poison (E) to finish: the shiv deals much more damage to a target below 30% health.

Cast Hallucinate (R) to bait their spells: you briefly disappear and reappear with a clone, which explodes on death into three boxes that fear.

Place Jack In The Box (W) on their escape routes or at a camp entrance: invisible after a delay, it fears champions who come near, then shoots them.

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.