Bug: Perpetual effects are characteristics of the card, and should be copied
Perpetual effects are supposed to "modify the card", IE, overwrite its characteristics, which means they should be copied by effects that copy the card. They are not. I used an Assimilation Aegis to exile an opponent's card which had been modified to have Flying (and +1/+1) by Elspeth's Command.
When I equipped this to my own card, it became a 4/4 without flying instead of a 5/5 with flying.

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UsernameDoesn'tMatter#61489 commented
"The copiable values are the values derived from the text printed on the object (that text being name, mana cost, color indicator, card type, subtype, supertype, rules text, "
If "perpetually" is treated as "text printed on the card", which other sources say it is, it should be copied. If not, it shouldn't, however, all references to Perpetual should stop saying "as if written on the card" and should define it as a permanent effect instead (and parenthetical to note that it won't be copied).
As currently written and described, it should be modifying copiable characteristics. Again, I understand this doesn't have comp rules support, but it shouldn't be worded in a such a way that the implied rules text contradicts with the way it's coded.
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Rezzahan#77802 commented
Perpetual effects just stick to the card, whereever it goes. But they do not change the nature of the effect and in which layer it is applied. A layer 7 effect will be applied in layer 7, perpetual or not. Only layer 1 effects change copiable values, and layer 1 comes first. Any effect in a later layer is not copiable.
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UsernameDoesn'tMatter#61489 commented
I recognize that Perpetual is an MTGA-only effect and therefore doesn't have Comp Rules support, but the nature of it makes it clear how it should be treated as a characteristic.