While Shiv can be built with a focus on either of his first two abilities, this build assumes that you play with Melee first and foremost, along with the alt-fire for close-medium range damage. Knives can be a huge DPS boost once you land them, Slice and Dice gives another burst of damage that mixes up your position or can act as a simple dash to dodge certain abilities, Bloodletting with Healbane can let you survive at 0 given that you kill someone before you die, and Killing Blow is self-explanatory. Killing Blow is maxed out later because you can usually use the rest of your kit to close out most kills and there are a ton of stuns/negations that can deny it and the refresh nowadays.