These cards can be used in conjunction with Apichimata Bingo Mats and the Parallage Phrases. Students can also sort the cards by regular modes vs. plagal mode or by what type of scale they use. Once they know all 8 heirmologic mode keys then they can put the mode keys in order.
Please let me know if there is any other information that you think would be good to have on the back of the card. I have wondered if adding the martyries for the appropriate scale would be good or if that would be too much information.