This build, in my opinion, over powered for twisted fate!
The damage output on this is extraordinary, and best that i've seen so far for any twisted fate build.

NOTE: you don't need smite, but if you want to be on the safe side of things and have the option to farm faster than your opponent, then go nuts! P.S. it actually does work!

Also with your build, choose whatever you want for your last item, use your imagination ;) enjoy! ;)

Pros.
-Amazing damage output
-Best ganker
-Amazing late game and Mid game
-Can 1v1 anyone!
-Slow and stun
-Able to take out the tank with ease
-Quite dependant

Cons.
-Squishy
-You must farm at early game!
-Getting stunned results to your death
-Heavily focused in team fights
-Lack of survivabilty items

Ok, basically this build is based on Secondary magic.

Beserkers Greaves - you need the Attack Speed.

Malady - Gives Secondary Magic damage, Attack Speed, Ability Power, and also reduces the enemies Magic Resistance.

Sword of the Divine - Gives alot of Attack Speed and the extra 100 Secondary magic damage combined with your E's passive. ALSO if you're up against a Teemo (Blinding you) or a Jax (Dodgeing you) you are able to use the Sword of the Divines active to ensure no MISS or DODGE.

Wits End - Again, Attack Speed and also Secondary Magic Resistance, also gives you a small amount of Magic Resistance which is better than nothing.

Madreds Bloodrazer - This item tears through you opponents like you wouldn't beleive, at this point you should also be dealing atleast 300~500 Secondary Magic damage with each hit, you watch the numbers fly!

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Ok, now this is your last items choices.

Guardian Angel - If you find yourself abit TOO squishy for your liking.

Hextech Gunblade - Life steal and more Attack Damage does you some good! HOWEVER! Secondary Magic damage CANNOT be spell vamped. So seeing as that is your main source of damage, you may want to think about this.

Infinity Edge - Works like A Charm, with everyone getting Magic Resistance to counter you, you come out with THIS!

Frozen Mallot - If you find yourself chasing alot, although if you don't want to waste your item slot for this, you could always get a red buff.