Urriak Uruk
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Interesting to compare this with the last reported rankings on the "Rabiah Scale" of how likely Magic is to feature an older Plane prominently again:
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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
Indeed it is! Using both, you can give them an overall "setting likelihood" score; 1 being extremely likely, 10 being not likely.
Alara: 6.5; three sets, and medium Rabiah.
Amonkhet: 7; two sets, medium Rabiah.
Dominaria: 1; many sets, great Rabiah.
Eldraine: 7; one set, good Rabiah
Fiora: 7.5; two sets, medium Rabiah
Innistrad: 3.5; five sets, perfect Rabiah
Ixalan: 7.5; two sets, medium Rabiah
Kaladesh: 7; two sets, medium Rabiah
Kamigawa: 7.5; three sets, weak Rabiah
Lorwyn/Sahdowmoor: 6; four sets, medium Rabiah
Mirrodin/New Phyrexia: 5; six sets, medium Rabiah
Ravnica: 1.5; nine sets, perfect Rabiah
Shandalar: 8.5; one set, weak Rabiah
Tarkir: 6.5; three sets, medium Rabiah
Theros: 5; four sets, good Rabiah
Zendikar: 3.5; six sets, great Rabiah
This scoring system puts a lot of settings close together, largely because only a handful of planes have more than four sets. The ones that do "clear the pack" are notable;
Dominaria, Magic's first setting, has a perfect Rabiah score of 1, and the most sets here. It's obviously the most notable and detailed setting, and when (it's not if) it gets another card set, it's a prime candidate for a setting book.
Ravnica is the only one to get close, as it can't match Dominaria in set count. But it gets really close, as it too has a perfect Rabiah score.
Innistrad is the third plane with a perfect Rabiah, and has five sets; a lot, but the world is actually not as detailed compared to the two above. Zendikar ties, having a slightly lower Rabiah at two, but more sets.
Theros and New Phyrexia come in with scores of 5. New Phyrexia has a load of sets at 6 (tied for third most) with a fine Rabiah score, and Theros has less sets but a better Rabiah.
It doesn't actually change the calculus here much, as they actually pine pretty close together, though it also points out the truly bad (Shandalar).