Congrats on your win!
I was your opponent (on Stax) in round 4. That game 1 was intense, and you played it quite well. Not cracking the fetch in response to my Spyglass stuck out to me in particular. I didn't fully think through the implications of your decision not to crack it. In retrospect it seems clear that you're signalling that mana is not an issue for you. I was trying to keep you just constrained enough on mana that I could edge out the last few points of damage, but I think that was a misguided plan after having no more ways of pressuring your mana (e.g., Ratchet Bomb or Tangle Wire).