Thankfully, Magic is not yet at a point where a new set is released every single week, so looking back at previous week’s metagames is still a great starting point, especially towards the middle/end of a format’s cycle. Outlaws of Thunder Junction released 2 months ago now, so the metagame at this point has mostly stabilized to any new additions to the format. While there are still some innovations week-to-week (such as the new High Noon Jeskai Control deck), especially during weeks with no new data being released, we can safely assume that nothing too drastically changed that would prevent us from using previous week’s data to make reasonable conclusions.

Here’s where it really pays to be chronically online. There are a lot of great people out there who spend a large majority of their free time reposting deck results and sharing analysis of metagames. Fireshoes and Bamzing on Twitter are both great places to find decks while MTGO results are down. 

While Discord servers can also be a great place for individuals to share data and results, I would be slightly more wary of these avenues when looking for good reliable data. Dedicated archetype-specific servers can be a breeding ground for FNM Heros and bad actors, people who want others to look to them as experts, while they have close to no quantifiable results to back it up besides having different colored nametag. If you are good enough at parsing through the good and the bad, these channels can be ok at finding new ideas that players are already testing.