Beastvold

Hi, All, New player here, so maybe I'm missing an important mechanic. I've seen lots of posts on cards to use for different character builds, but I don't know how to build a character quickly with my ideal cards. As far as I've seen, my character's build is entirely dependent on what items I found on the previous scenario. And if I'm looking for specific cards for my build, I'm going to have to play many many scenarios just to find the cards one at a time (assuming I even find them, with the luck of the draw). And then, if my build isn't working for me, I have to start all over hunting even more cards down to try something else. Is there a faster way to get cards switched in and out? (Assuming they have been found and are in my vault?)