Viktor vs Aurora

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.

Take a trade once Across the Veil (W) is used: it's her spell to vanish, on a 22 to 18 second cooldown unless she takes part in a kill.

Take short trades: every spell or auto that hits you releases a spirit that heals her, through Spirit Abjuration (passive).

Don't fight inside Between Worlds (R): she teleports from edge to edge, and crossing the edge slows you. Get out early, with a dash if you have one.