Yeah I was hoping for a multiplayer goldfish-style experience, maybe something like tabletop simulator. Maybe I'm doing it wrong but this doesn't seem to be any better than the built in archidekt/moxfield tools
at the risk of being the shill but i think its helpful and what you are looking for, https://untap.in/ does this, solo play both mirror play your deck AND deck vs deck where you play 2 decks as one player, alternating turns.