Viktor vs Ahri

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.

Keep minions between you and her: Charm (E) stops on the first enemy hit, and without it her burst lands far less often.

If you can only dodge one pass of Orb of Deception (Q), dodge the return: it deals true damage, which your resistances don't reduce.

Play hard once she has used the dashes of Spirit Rush (R): she has nothing left to escape with, and its cooldown is 140 to 100 seconds.

When she roams, avoid walking through the jungle alone: Charm (E) then Spirit Rush (R) let her catch an isolated target by surprise.