Rasaad's white specialize
Possible bug involving Rasaad Monk of Selûne's white specialize.
I cast rasaad exiling my opponents commander Sliver Hivelord with the ETB. They decide to leave it in exil. I specialize Rasaad into his white form. Turning the hive lord into a 1/1 with no abilities. My rasaad later dies, the hivelord returns to the battlefield as a 1/1 with no text. All my opponents slivers except for the hivelord are indestructible while the hivelord is on the battlefield even though the hivelord perpetually lost all it's text.
I am 99% sure this is a bug, I asked some judges if this involved some funky layers action but they couldn't help me because there are no actual rules for how perpetual works.
Bug encountered on PC playing Historic Brawl.
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[Deleted User] commented
My understanding is that although a player can clear all perpetual effects on their Commander whenever it goes to the command zone, until then all perpetual effects still apply. So in this case it should not have been giving their other Slivers anything as it had no ability to do so.