Ok fine. since this is getting out of hand i shall be the bad guy
What you are suggesting mate, is a 0 micro unit (like a ghost that you keep in your army) with huge auto attack farming capabilities aswell as an ability like fungle (alltho purely dmg. but same in terms of farming), with the survivability of a colossus which can restore its shield!! that makes for 2 emps+ a snipe to kill that tosh boy.
So. alltho i really like that someone makes a hero suggestion, especially a thought out one like this, I strongly advise against implementing this without nerfing it at least 10000 times, because it would be my first pick in a pre just after reading it, in any case
point is, this unit has 100% save farming capabilities (especially with autoattack), and i dont see any viable counter which couldnt easily be played around or completely nullified with merely an investment.