Last year, I designed a custom magic set with modal dual-faced cards, which also were capable of transforming. Routinely the reddit feedback was 'these can't do that.' I responded with 'the rules would be changed, if these were real.' The normal rejoinder was 'that can't happen, because the rules are not that way now.'
Anyway, spider-man's bringing modal dual faced cards and my genius is such an overwhelming weight sometimes. #magicthegathering