I asked this a while back when I first discovered this site, courtesy of Mr. Anderson, but I may have posted incorrectly because I haven't seen a reply. Are the two cards, seraph and seraphim considered duplicate cards? I try to follow the chart---art looks the same; reference is same (I think), and I'm pretty sure one is just the plural of the other, but I'd like to clarify it as I start building away at my various decks.