Viktor vs Talon

Poke with Hextech Ray (E), fired in the direction you choose: it hits every enemy in its line, and its upgrade adds an aftershock in its wake.

After Siphon Power (Q), land an auto within 4 seconds: it deals bonus magic damage, and the spell's shield covers you during the trade.

Place Gravity Field (W) in your target's path, then fire Hextech Ray (E): the field slows them, and if they stay in it for 1.25 seconds, they're stunned.

Glorious Evolution (passive) upgrades a spell every 100 Hex Fragments: Hextech Ray (E) to poke and clear, Siphon Power (Q) to survive, Gravity Field (W) to slow.

Place Arcane Storm (R) on grouped enemies: it follows the champions it just damaged on its own, and you can recast it to move it.

Get out of the path of Rake (W), especially on the return: the returning blades slow you, and each spell that hits brings you closer to Blade's End (passive).

Push your wave whenever you can: he then has to stay and farm instead of roaming by vaulting walls with Assassin's Path (E).

If you can engage, go for him while Shadow Assault (R) is on cooldown: it's his main way out of a fight, and it comes back in 100 to 60 seconds.

Ping your team as soon as he leaves your vision, and ward the paths behind walls: Assassin's Path (E) lets him vault walls to roam through the jungle.