Mobalytics - Spirit Calico by Hydration

If the lane is passive, buy Sprint Boots first item and get Ava 2nd and put 1 point in Ava, go get boxes.

One Shot Combo: Cat to find someone Leaping Slash -> Arctic Blast -> Gloom Bombs -> Quick Melee if needed -> Return to Shadows
This should do 60%-80% of most enemies at this point of the game.

Scourge + Escalating Exposure if needing to be useful in teamfights

Buy Fortitude if you need the regen
Debuff Remover if necessary
Defensive Options
Phantom Strike to deal with flying heroes.