This month's Challenge data is unfortunately smaller than September's. There were only 4 challenges, and Matt and I were at Eternal Weekend last Saturday so we missed collecting that data. Rather than doing a poor job inferring from the top 32 summary, we decided to omit that challenge from the calculations (I added the top 32 metagame for display only). If anyone recorded results, send Matt or me a message and we would love to add them in.
The performance of shops in this data stands in stark contrast to the success of that archetype at Eternal Weekend and last month in the vintage challenges. In particular, shops had a 58% winrate versus xerox at Eternal Weekend, but just 34% here. The fast pace of metagame changes on MTGO could very well be the cause of this; if anyone has time to look at the differences in decks that would be fascinating to see. Or perhaps we can just mumble something about small sample sizes!
Thanks to Matt for help with all of these reports.