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Mission complete!
I hadn't planned on doing this, and at the beginning of the month, I didn't even think I'd go for Grandmaster. However, noticing that I was doing well and that I had enough time, I decided to give it a shot this time and grind. It took me a total of 8 days (but I had already gained about 2.5K before the serious grind). I reached 7K using different decks, with the most successful being the Sword Coast decks, although I also regularly got win streaks with other decks. The funniest thing was when I had a 70% win rate in the log for a silly ramp deck without any win conditions, except maybe Canyon x). After reaching 7K, I got stuck there for a couple of days... Perhaps the nerfs had an impact; I needed to figure out how to optimize the decks. In the end, I switched to aggro forest and puppet portal and grinded to 9K with them. Today, I got a daily quest for Sword Coast, so I gained the last thousand points with it.
This was the final stretch:


I passed the trials on the first try, losing in the mirror match first, then winning against the puppet portal, and then in another mirror match.