First of all,
very nice site! Thank you.
I have a following suggestion regarding Card Import feature:
Import cards in the following format
#have #spare #need Name_of_card (in addition to the current #have name_of_card format)
e.g.
3 0 1 Earth Shock
4 3 0 Rak Skyfury
it will greatly improve the will to participate in trading if we don't have to adjust those numbers manually 
Thanks,
Kuba