Viktor vs Orianna

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.

Don't stand in the path of her ball, because Command: Attack (Q) damages every enemy it passes through before stopping.

If you can engage, target Orianna when her ball is far from her: her spells come from the ball, and she has no dash.

In teamfights, don't stay grouped with your allies near her ball, because Command: Shockwave (R) pulls every nearby enemy toward it.

Back off when her ball is attached to an ally diving your team: Command: Shockwave (R) will then come from them.