primal isle
"when possible, always draw stone cards after discarding" (thank you alyssa_lacreatura)
Basically when you discard, if you have stone cards in your deck, the draw gets randomized between them, instead of every card in your deck.
Alternatively, it could force stone cards to go to the top of your deck when entering a round.
The whole point is that pumice is a super lightweight stone that floats but yea. It'd be pretty cool if it also made stone cards whiter, to look like pumice.
heavy brook