There are only four planes in all of the game of Magic: The Gathering that will never be revisited.
Out of the dozens of planes in Magic history, very few have gotten the highest and lowest marks on returnability. The Rabiah Scale goes from 1 (will definitely go back) to 10 (would require a major miracle to even consider going back). 1 and 2, for example have a good mix of popularity, profitability, and leaving a lot of things for developers to play around with. That's locations like Dominaria, Innistrad and Ravnica.
However, on the opposite end, there are four planes with a 10 - meaning that we'll never see them in paper or online Magic again, and that the most we'll get from them, if we're lucky, is a mention. And going down the list is:
1. Rabiah
Rabiah should be a given, considering that the entire scale is named for it. The Middle Eastern inspired land from the Arabian Nights expansion all the way back in 1993, Rabiah came with problems. The first is the possibility of racist overtones. Even with Wizards of the Coast really zeroing in on this issue for a long time, there were still a lot of problem cards - 7 had to be outright banned in 2020.
Even without that, Rabiah also was unfortunate to be based on an existing IP - One Thousand and One Arabian Nights. In a weird way, this was (technically speaking) Magic's first Universes Beyond expansion. However, even though it is public domain, they based things heavily on it, down to the names. Other Magic planes can borrow themes from King Arthur and Grimm's Fairy Tales, but still alter it enough to make it their own. Not so with Rabiah.
And just in case of any hope, Mark Rosewater had to come out and say "Rabiah is a 10. We’re not revisiting someone else’s IP (intellectual property)."
Besides maybe a joke card in an Un-set, Rabiah will probably never be seen again.
2. Portal Three Kingdoms Plane
Like Rabiah, Portal Three Kingdoms, which came out in 1999, took place in a literary land. From the book The Romance of the Three Kingdoms, the portal was, essentially, on Earth - specifically China from hundreds of years ago.
As if that wasn't enough of a reason to give it a 10, the whole Earth thing, it was yet again an IP that wasn't their own and that they didn't have the rights to or alter enough to make their own different version. And again, it just goes to show just how old Universes Beyond as a concept really goes.
Magic developers even admitted this, with Ethan Fleisher admitting that "Portal Three Kingdoms doesn't take place on a plane of Magic's Multiverse. It's more akin to a Universes Beyond thing, set in the historical novel The Romance of the Three Kingdoms."
3. Bablovia
This plane was technically only in an Un-set, Unstable, in 2017, but it is nonetheless listed in the Rabiah scale as the plane is in an UN set that is semi-Eternal legal. A steampunk world, Bablovia was one and done in Unstable.
Fans wondered for years if the plane would be seen again, but Magic had to shut any speculation down and give it a 10. While it is a plane, it is set in a different Multiverse. And as an Un-set making it Standard legal would have some issues.
As per Rosewater: "A 10 as it’s in an entire different multiverse and thus has no chance of appearing in a Standard-legal set."
4. Tolvada
Finally there is Tolvada. The homeworld of Kaya Cassir, Tolvada has the distinction on this list of appearing in more than one expansion. However, as seen in March of the Machine in 2023, there is a very good reason why it has a 10 - it was destroyed. While it still has a very remote chance of appearing again, through some sort of time travel scenario, it is for all intents and purposes not going to be seen again.
From Rosewater again: "Tolvada is a 10 as it’s destroyed. It would require us going into the past to visit."
Currently those are the only four, with a fifth member of the club likely to join sooner or later. There are lessons to be learned here (Don't use someone else's IP without permission, for example), but mostly, it's a look into Magic that will never be again and how to build from there.
