The standard build for a standard TF in a standard game of League of Legends.

+ Win
- Loss of Dignity

Snowball fights are fun.
The jungler will have an easier time donating their first buff to you.

Slightly unorthodox but allows you to fulfill any role at any time.

Mana is needed for Destiny Spam.
You need Energy for your jogs.
Contribution to inflation.

Your passive makes the economy worse.
Your ult is the most powerful spell in the game; it allows you to reveal every opponent on the map so that you can continue to farm.

You should start out by rushing a Duskblade. It is a powerful item, providing a large nuke and a strong albeit short slow as well.

The next item should be a Duskblade. It can be very good, as TF is a champion that benefits from AD the most, and the effects are nothing to scoff at.

The third item should definitely be a Duskblade. It is a solid choice at this stage of the game, and it allows you to assassinate people should they ever walk into you.

The fourth item in most situations is a Duskblade. It provides CDR, AD, and Lethality, making it a good pick up and it allows you to burst people down.

The final damage item can be a situational Duskblade. While a bit of a waste since the CDR overflows 40%, and the unique passives are quite mediocre, your core build should already cover most of your necessities that this is still a decent choice.

Your final item are the illustrious Boots of Speed. This will unlock the enemy Nexus and allow you to end the game.

If you lose with this build go play HoN.