Pros:
-Great Damage output
-AOE DMG
-Can be a great Suporter
-Good Harrasing early on

Cons:
-Squishy
-Will be focust first most of the time
-can have some Mana problems
-Skills need some Skill to be used effective

Mark:

Well of coursefor magic Pen. There is honestly nothing i would change about this.

Seal:

Anything for Mana, i choosed mana reg, but you can choose anything you want, just to have some more Mana in early game untill we get.

Glyph:

You can ether Choose Ability Power, like i did or you can take something for cooldown reduction.

Quintessence:

I choosed Ability Powerfor more DMG in early game, but u can alsow choose Healthfor more survive ability.

There are Various Start Possibilitis:

You can ether start with oneTome and oneHealth Potion
or
With oneSaphire Crystal for more Mana and twoHealth Potion

But alsow withboots and twoHealth Potion and oneMana Potion.

Other good Items:

You are free to change some items I mentioned above:
Items you shouldn´t change:
-Tear of the Goddess-Fiendish Codex


Items who are alsow good:
-Mejais Soulstealer(only take this item if you are shure you can get at least 10 stack´s otherwhise this item is not as usefull as others.
-Will of the ancientsMass AP and some Spellvamp.
-Moonflair Spellblade, take this only if the enemy has a lot of disable champs (like fridl, Sion or Nocturne)
- Void Staffif the Enemy has a lot of resistance based champs take this one.

Early Game:

In early game you can easily Harrass withCommand: Attack andCommand: Dissonance. If You are at a site line you can alsow support your Lane Partner and Harras your enemys at the same time withCommand: Protect.

Mid/Late Game:

As soon as we get lvl 6 and our Ulti, we can start with our BALLS TO YOU! Combo. at first useCommand: Attack to get ur Ball near your enemys. Then useCommand: Shockwave to get your enemys right next to ur ball. and then useCommand: Diconance.
If they survived this you can finish them up withCommand: Attack andCommand Protect.