Hey. I bought a lot of daily boosters for the past month or two but never felt like selling cards until now, and naturally I accumulated a lot of duplicates, so I thought of the following:
My suggestion would be some QoL changes to the Inventory - new filters to show:
duplicate cards (include/exclude the ones you are currently using for charge upgrades)
cards with missing charge upgrades
upgraded/unupgraded cards
unowned cards (maybe with the ability to test them in the forge, similar to how you can test cards on the Market)
two-coloured cards (e.g. if you want to look through your bandit cards but don't want to see pure fire & pure shadow cards)
legendary cards (currently, you don't see any neutral/legendary cards when removing all 4 colours in your Inventory)