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So I read it all and it looks to me like we might have around 2,000 real players, if we consider 2nd and sometimes 3rd accounts I wouldn't be surprised if there are 1,000 actual humans playing in modern right now...

Seems about right to me. And a good bunch of those are mainly Chaos Legion decks.

Like 80% Chaos legion decks? That would be another great question to answer. If Chaos legion moves to Wild will we have 400 players left in Modern?!

Its possible to investigate that with this approach too since I use their battle histories. Should be decently accurate to just see if they used any rebellion cards, so its just a little more data processing in the first step. Maybe I'll try that.