Viktor vs Veigar

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.

If Event Horizon (E) lands around you, stay inside: only the edge stuns, and the cage disappears after 3 seconds.

Get out of the Dark Matter (W) zone as soon as the spell shows: it hurts a lot, but falls from the sky with a delay.

Dodge his spells and deny him kills: with Phenomenal Evil Power (passive), each spell that hits a champion and each takedown gives him power.

Once he hits level 6, don't stay in his range at low health: Primordial Burst (R) deals more damage based on your missing health, peaking below 33%.