Board Game Arena

Put in the Divine Influence expansion. It adds depth and complexity to the game, and will force more players to take the time to learn it rather than a lot of players just playing base game. Also *maybe* drop the player count for Arena down to 2, just because this (as a complex perfect-information game) is one you'll really struggle to get 3 players at a time in (and really have to wait awhile if you want to force it) because it won't attract many casuals. At least at 2 players you'd be able to occasionally get an Arena match that launches, every now and again.