The D6 has been added, along with upgrades all the way up to D20!
I tested and played around with the card cleaner idea, and designed it into what *I think* works OK.
It's rare, so will be infrequently seen in the shop, and costs 3 chips. It's called Magic Marker, and before scoring, it sets all played cards to a random rank. Not too crazy, can help with lategame transitioning or early game powering if you're lucky enough to see it.