Personally, I played a Mono-G stompy thing in Explorer when it first came out, so I still have that available to me.
In paper, I play Gruul Boats (despite it not being a significant player in the current meta), but my list is definitely out of date and could use a few updates with cards that have come out over the last year.
Definitely looking forward to playing decks that didn't exist in Arena before, even if that means having to finally deal with Niv to Light and Lotus Field combo finally.