laning sucks for laning but it could scale if you play well (the enemy is bad). Dark harvest only procs when they get low compared to arcane comet or first strike so its not the best since shacos damage is poke-ish and very scattered. If you somehow manage to stack it up though, youd probably want to build burst in stead of burn damage. Your E and W would deal massive damage.
Mid to late game, since your ult cooldown gets pretty low, you can walk into blind places with your clone in the jungle. It's a good one and always works, that way you wouldn't be able to get ambushed. It's impressive they got caught by many baits in this video, how are they diamond to masters lol