Only dim is bugged for the record. There is no reason for antimatter to go through a shield either if you think about it (other than 'we are used to it'). Nowhere in any shield card or even in the antimatter card says that creatures with negative attack ignore shields, so I don't see why we should avoid more cards that behave like wings and gravy. (From the point of view of the game what happens is that antimatter probably gets checked when DR is computed, so the weirdness of wings / dims / gravy is likely because they are independent of DR)