im not a game designer but i do feel like it could work with having an extra mode
one being
before a runyou draft a small pool of jokers, vouchers etc
you can only see or buy from that pool during said run.
focusing on optimizing a constrained build
progression could unlock stuff like
larger draft pools
more reroll tokens etc
starter synergies are a main focus making it a more plan based mode that stress tests builds kind of like a guantlet
by itself or paired with a modified boss blind only system could be fun
maybe something like a locked function flush based, discard based, face cards, etc
jokers reinforce the progression unlocks and harder weirder starting constraints
maybe you cant replace the base until you win a certain amount maybe.
Shops offer upgrades only within the parameters of your base.
or maybe even something that tests your understanding of the game mechanics or cards with predetermined blinds that are more like puzzles
and completing puzzles unlocks harder scenarios or rarer starting jokers
the scope of any of these isn't really needed to be huge or groundbreaking mechanically just something auxiliary to the main bread and butter of the game, and virtually anything could be taken out or replaced to make it work better but they're just basic ideas.
I mean maybe even a freeplay mode or a small story mode would be engaging.
i wouldnt say that the challenge decks really change why you play rather just how
i'm looking for both.
someone made a multiplayer mod that pins your blind feats against each other to win (which I'm not asking for but it's a good example of how to use the same gameplay loop to achieve a different goal.)