Can we trade for more than one of each deck? For example, could I have, say, arrogant13 for sakabatou14, followed by bolverk03 for sakabatou10?

Also, I notice that in your example, card worth trades are considered equivalent. Can we combine two letters (e.g. two single cards such as cthugha and darkevangel) to trade for one card of higher worth, such as a puzzle or special?