Pain Mirror | Pain Reflector

[Higurashi]

Technically, yes. They're simply automatically protected when played. There's no named ability that we can see that denotes that among permanents, unlike how "immaterial" denotes a creature will come into play invulnerable.

[AnonymousRevival]

Oh, hah, I didn't actually even see the attributes, however, I do recomend the immaterial ability returning to aether otherwise, aether wouldn't be different from the other elements.