Use this build in-game
Build ID: 284800 - copy and import it in the Deadlock shop
Spirit spike = 12% gun damage increase while also making your sniper actually do damage (otherwise it does like 90 base). I find it easier to scale when my sniper actually kills people. In upper lobbies, where the player skill gap is smaller, it is easier to just go gun and rely more on your team to CC and finish kills early. However, when you don't have that luxery you need your assassinate ability to actually be able to assassinate people. Otherwise, you don't scale into the late game and become usless.
Recommended ability leveling order for this build