doctorbadwolf
Heretic of The Seventh Circle
That’s one way to go, but I really hope it also includes like, Dragonlance, Mystara, Chris Perkins’ world of Islands, Nentir Vale, and notes on how these worlds were built, what themes and genres they cater to, and pretty deep and highly usable world building advice.So, there are 30 worlds tracked on the Rabiah Scale, including Ravnica (already covered for D&D) and three Planes that rate 10 (basically zero chance of ever getting attention in M:tG ever again). A couple of the other worlds literally no longer exist anymore (Serra's Realm, Phyrexia).
The 24 remaining worlds, with the arguable exception of Dominaria, have very, very little actual world-building development, and could be summarized effectively in a handful of pages, probably less than 100 pages to effectively Gazeeter all of these worlds adequately. One way they could go would be to massively expand the world's one by one to fill a larger book. But another route, that is increasingly appealing to me as a possibility and not mutually exclusive, would be to leave the settings fairly sketchy, but develop the Planewalking scene as a metasetting the PCs could belong to, with visiting different worlds being like visiting different countries or cities in other settings. Bring in some appropriate Class archetypes, add the neccessary Races, some Monsters and Adventure Generation material aimed at making Planewalking stories...
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Rabiah Scale
The Rabiah Scale is a ranking of the likelihood that a given plane will be revisited as the setting of a future Standard-legal set. Planes are ranked from 1 (very likely) to 10 (very unlikely). As one of the Rosewater Scales, the Rabiah Scale is analogous to the Storm Scale for mechanics. The...mtg.gamepedia.com
Stuff like how deserts form, is surprisingly useful for making a map!
Then add in some player options and monsters to support both the settings and characters of the themes and genres mentioned, and make it a PHB sized book.
I’d put the whole remaining Gate Watch on the cover, plus some of their friends and maybe a DnD originating world-hopping character, and just bloody well have fun with it.