The copy made by Ertha Jo's triggered ability is created on the stack, so it's not "activated." If an ability is linked to a second ability, copies of that ability are also linked to that second ability
If the future state is that Panoptic Mirror, Mirror Universe, and Lich's Mirror are all "Artifact - Mirror" cards, what's the harm in that
It only destroys. Illustrated by Shiyu Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
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Finally, heres the exact steps for casting a spell or resolving an ability in Magic, which players often perform out of order: Move the spell or ability to the stack
Appearance A cards surface finish and stock weight directly affect how designs appear when printed