Hello people, I am here to share my suggestions i've come up with. Keep in mind that these are purely hypothetical and likely underpowered or overpowered.
I play Balatro very casually, i've messed around with the cryptid mod a few times and its fun, but not quite what im looking for. I've noticed that stone cards dont get a lot of recognition or use (to my knowledge) and i've come up with my own ideas to give these cards their own use, including a few jokers!
Joker 1, The Dodo. (Uncommon)
Effect: When a STONE card is played, destroy it and gain 0.2x mult.
Joker 2, Pickaxe (Rare/Uncommon)
Effect: 1/3 chance for each STONE card held in hand after scoring, to trigger one of the following 3 effects:
Sapphire: +100 chips
Ruby: x2 mult
Emerald: +$5
Joker 3, Medusa (Rare)
Effect: Played Face cards become STONE cards.
Joker 4, Archeologist
Effect: Played STONE cards gain a gold seal.
These are my joker ideas, just trying to give stone cards the recognition that i think they deserve.