I really like your concept! Also, your talents are very well-named and fit Sombra's theme. Are you sure she wouldn't make more sense as a utility Ranged Assassin? She seems to be able to dish out a bit of damage. I don't know about Off the Grid at level one, permanent Stealthed 30% move speed that early in the game seems kinda broken. I mean, Valeera gets hers at level 20. I don't really understand the Everything Can Be Hacked talent, does that mean enemy heroes can't capture the merc camps?...

I see what you mean, and it's a similar sentiment shared by other readers, so I tried to make the passive bonus very minor; only shortening their Hearthstone channels, which hopefully won't affect them as much and give them more independence in being drafted/chosen. However, I left the level 20 talents for both of them there with minor adjustments so that the team who picks them together can gain a reward if they manage to obtain level 20, but they need to talent into it. Thanks for reading!