Mostly standard, since I don't like drafting to much. And due to the not rotation I finally have a solid land base to try a lot of different stuff.

I enjoy Explorer lately although the meta is very stale some days.

Otherwise Historic Brawl is fun. When I feel particularly casual I just skip opponents on there if I stare down the 6th Atraxa pile in a row.

Also, for me Explorer feels nicer than Historic lately due to the digital only mechanics taking hold in the meta. Just not my favourite style of play.

I mostly play Historic on there, because it lets me build with (almost) all the cards. But if I face three Elfball decks in a row, I'll throw in a couple rounds of Standard or Explorer.