Yeah, that's really impressive!
Most of control decks out there in Mythic cost between 1 and 2 ETH, that's quite a lot for me at least.
But the possibility to earn in GU with ZERO money invested blows my mind!
I have faith in this project and I'm going to commit myself to make much more content related to GU in the near future!
For now I'm going to try my own F2P deck at Mythic rank, but soon (maybe 1-2 weeks) I'm planning to try few other budget decks (under $50, hopefully under $30 if I can find one) and record me competing with those decks at Mythic on Weekend events.