Are you talking about the ETC item called Monster Card or the monster cards that are added to the monster book?
no! example: 500pcs squashy liquid trade 1 slime monster card! i think its good way to gather monster cards for unlucky guys haha monster book card
also, limited boss monster card like Opq ppq, trading 1000 pcs star + moon + sun piece is dood idea for missed boss monster i think !!!
Oh I thought you meant the other way around, like somehow storing the extra monster cards and then trading them. I like the idea! Could be interesting.
The only reason I don't like this idea is because then getting the best medal in the game would just be pay to win (buy etc. drops with mesos). I like the challenge behind the way it is right now but maybe it'd be cool to see it with untradeable etc. items.
umm i think buying card for mesos is challenge in another mean and... only few ppl will sell etc items, because ppl know ulu, petri is best for earning mesos! i really sad ppl throw away their etc items calling useless.. i wish etc items is useful all monster without specific quest haha
or if possible make it so that you have to sacrifice 2 cards (either randomly selected in your book, for you have to fetch 2 random cards via a quest), in order to do the trade every time makes it turn into a risk, much like using a 30% scroll or clean slate want to P2W? well if you get junk cards at first and spam buying the hard to get ones, there is a chance the hard to get ones are gonna get sacrificed by the will of the almighty RNG