fun fact:you can kind of softlock yourself out of the ability to remove/change cards:you initally start with 20 tools.didnt even know their purpose until late game after the final boss when I tried checking out other cards for fun.at some point I had a full deck again but only like 6 tool left.
Basically if I had used up all tools by removing cards and hadnt put at least one tool card in, there would be no way to get tools ever again.so I couldnt remove cards anymore and therefor would be stuck with the current deck.
wasnt an issue for me given how good I am (lol) but if I were to type to frequently change my deck I would hve early on encountered this problem.
just imagine it:
you have an attack and buffs only deck currently, already using the max possible capacity and got no tools.no problem for the moment. but once you get to the next enemy, your strength might be inadequad so you would like to change your dekc up.but guess what?
you cant cause no tools left from the previous card switches.unlucky you.if you didnt at least have a tool card in your belt (which we assume you dont) and you have no upgrade card either, then your strength cant grow, you also cant change to a growing strength kind of deck.yep, softlocked due to strength unable to increase anymore.
just saying, not an issue for me but thought of it here.
maybe make buying single tools at pretty high gold price, so it is at least possible to escape the softlock sooner or later.