Viktor vs Akali

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 Twilight Shroud (W) is used: she can't vanish again until its 20 to 16 second cooldown is over.

Play hard before she hits level 6: without Perfect Execution (R), her only spell to get back on you is Shuriken Flip (E), on a 16 to 10 second cooldown.

If you have AoE spells or skillshots, throw them into the Twilight Shroud (W) smoke: they hit her even while she's invisible, whereas targeted spells can't be cast on her.

Take a trade when she has just cast Five Point Strike (Q) several times: each cast costs 110 to 70 energy depending on rank, from a base pool of 200.

Hit her right after the first dash of Perfect Execution (R): she has to wait a moment before she can cast the second.