I have a deckbox.org .csv file of my entire collection. I edited the .csv formatting to match Echomtg's formatting. After the import, most of the cards did not show the correct expansion. I also noticed that the format for entering foils is completely different between the two systems, which means lots of manual editing.

At this point, I have almost 30k cards in a .csv that just doesn't play nice with Echomtg. Is there an easy fix?