First things first, I am completely against the idea to bring back old dungeons to the seasonal Mythic Plus rotation but it seems cycling old content becomes a thing by thinking of classic servers and old expansions.
If that is what they intended, to make the seasons more interesting and challenging, I think they should bring MoP challenge mod rewards back adapted to mythic plus. If any of these dungeons are taken in the seasonal rotation, bringing the challenge mod rewards back will be a great idea.
Timing any of
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Temple of the Jade Serpent
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Stormstout Brewery
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Gate of the Setting Sun
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Shado-Pan Monastery
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Siege of Niuzao Temple
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Mogu’shan Palace
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Scholomance
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Scarlet Halls
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Scarlet Monastery
on M+ 20 difficulty on both Tyrannical and Fortified will reward the player with an Ancestral Phonix Egg used to redeem one of the
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Reins of the Violet Pandaren Phoenix
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Reins of the Emerald Pandaren Phoenix
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Reins of the Crimson Pandaren Phoenix
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Reins of the Ashen Pandaren Phoenix
the adorable mounts that every collector dreams to have.
About Zul’aman and Amani War Bear
Zul’Aman instance was originally a raid. Later, they transformed it into a mega-dungeon. Again, if Zul’Aman are taken in the seasonal rotation as two dungeons, timing the related bosses on M+ 20 difficulty on both Tyrannical and Fortified, will reward the player with an Amani War Bear.
Blizzard please do it and I will sub for 10 years.