Farming:
Use your arcane smash on far away minions in order not to get within range of the opponent.

Combos:
E > W > Q > R
W > R > Q > R > E(as they run away)

Harass:
W > E > run away

Extra:
-Don't forget to use your ultimate if a member of your team (including you) is getting attacked.
-Stack a few Sapling Tosses in a bush to deal extra damage to enemies who walk by.
-After getting Athene's Unholy Grail, your Vengeful Maelstrom will stay up for a very long period of time. use this fact to bait enemies onto the other side of a bush, then deactivate when they are within the borders.
-Characters that have channeling abilities (such as Katarina's Death Lotus) can be stopped by standing close enough and using arcane smash.
-If you dive too deep under an enemy tower, use Twisted Advance on an enemy minion to escape quickly.