(ITEMS are final item build) This build is very offense oriented. Getting items always giving critical chance. What i thought was why get straight damage when if i get my critical chance high enough most of my attacks deal over double what my damage is. Many times i get 900 damage in one hit.
First start with doran's blade. Then boots of speed. Upgrade to ninja tabi. After get the bonetooth necklace. Then get the atma's impaler for armor and critical chance along with additional damage from its passive. Trade in doran's blade for either phage or a stepping stone towards an infinity edge. After continue with Executioners Calling for life steal and more critical chance. Top of with an Infinity Edge. BOOM. Your owning.
Keep in mind who you are going up against. Change Ninja Tabi to Mercury treads for needed magic resist. You won't have much sustain but you can assassinate anyone.