Shiv's abilities gain amazing benefits with their third upgrade, except for Bloodletting. So, this build mostly ignores it, and instead Lifesteal is focused to give Shiv enough sustain to close out fights. He doesn't have much time to do so, but he's also the character who should take as little time as possible to fight. It should also be noted that while there are the traditional Melee items, the Weapon items make Shiv's gun fairly strong, given that you use the alt-fire inbetween other parts of your kit.