So I recently discovered Elder Tale Online, and was considering writing an advertising post for it, but I'll definitely plug it here for you:
It's an anime (Sword Art Online, ./hack and another, I forget) inspired Isekai game with a combat system reminiscent of Slay the Spire. You actually collect cards, and the cards can not only be used in combat, but they grant 'Concepts' for other things. It's kind of lengthy to explain here, but suffice to say, it's REALLY impressive how it's set up, and this is from someone who's been mushing for ~25 years.
ETO features a "Duty Finder" type system that is essentially like running a PUG on an MMO, in a dungeon, complete with random events. Except the PUGs aren't nearly as noxious as they are in MMOs.
The overall theme, being Isekai, is that everyone is trapped in a virtual MMORPG, and as such you have not just a 'player' level but also a 'character' level to your character bit. IE, you have yourself controlling the player of the game, who is trapped within their own character bit within that game.
The community so far has been nothing but helpful, compassionate, friendly, and welcoming, and I'd highly recommend at least poking your head in if you're MUSH shopping. FC and OC are both allowed, and the game's vast system allows for just about any fantasy (and maybe even some steampunk) concept to be playable.
The only thing I can't comment extensively on is the RP, as I've only been approved for about 2 days and haven't had much of a chance to dive in, but given the quality I saw from the one Duty I took place in, I'd say it's going to be pretty high quality.
Also, alts are allowed (up to 3) but time gated (I think every 25 days or something) and there is a very active playerbase with staff run scenes/plots.
https://wiki.eldertaleonline.com/Main_Page
mush.eldertaleonline.com 7705