This mod is great. i personally feel it gives me something to work towards and reasons to try new things
thnx for making it. perhaps you can do something more with this system such as the following?
like maybe have it so the border and texture/colour are separate.
maybe something like this:

win with it in the deck -> silver coloured card body unless its a curse then just gold.
win with an upgraded version of this card -> gold coloured version
win with an upgraded version of this card against the true final boss/ cursed heart -> pearlecent/sparkly or just add sparkles on top of the card similar to how sparkling rares mod does
win on ascension 0-> basic border design
win on ascension 10-> decorated border design
win on ascension 20-> fancy border design

This could go so far as to become its own api that lets you modify cards for future runs based on stuff that happened in past runs.
if you do this stuff it would be super epic and bring this to another level
anyways i love the mod, good job.