Your third item should be Lich Bane and for some added attack speed get Rapid Firecannon. This is a combination that cannot miss. Twisted Fate is strongest once he hits level 6. His ultimate is an ...

Continue with Lich Bane as your third item, and for an extra kick of attack speed, grab a Rapid Firecannon. This setup is highly effective. Twisted Fate becomes a significant threat at level 6.