LGS tries new format

At my game store, we usually, once a mo(n)th, try a new format for the construct. First time was easy "no unique/18 rares". We got a discord with lots of propositions, some are kinda complicated to build. But next time we try "bi-faction, no unique, 18 rares".
ExAltered, end of set 1, got a tournament with that kind of building rule, it was a strictly 50/50 for the factions. Like 10/11 common and 9/9 rares.
Is there poeple trying with set 2 that kind of format ? Any link or idea ?