Hello, I got rank 3 (unfortunately not legend) with this deck and I believe you can reach legend with it, since mech hunter is top tier now (54+% winrate and growing). I've chosen some tech cards such as Faceless Manipulator and Boommaster Flark since they have brought me extreme value if the game lasts longer.

edit: i got rank 2 today

These are the ways I have used Faceless Manipulator to my advantage:

• Copy a powerful/buffed enemy minion (works even better with rush/deathrattle on them)
• Copy my own buffed minion
• I managed to copy my Leeroy Jenkins to deal 12 damage a couple of times

If this grows in interest I can provide a small mulligan guide and how to try to play the deck

https://gyazo.com/7dd9328c31676b03af17bff4e0824574  <----- win rate picture