Ok, this may not even function properly under current Dominion rules, but I took a shot at this.
You have a stack of 10 Hidden Witch cards as your Kingdom stack. Similar to Heirlooms, each player gets a Reference card for Hidden Witch. The Setup text on Hidden Witch may not be needed but I was unsure how else to set up the initial state of the Reference card. Could use some suggestions for this.
Spinster/Crone is the double sided Reference card for Hidden Witch. The Reference card is not considered to be part of your deck, but it does determine the text on the Hidden Witch cards in your deck.
So, a brief run-down of the rules for this (likely missed some things).
- Hidden Witch never has a different name than Hidden Witch.
- Hidden Witch has a set price, but I considered making it dependent on the Reference card.
- Hidden Witch does have the card type "Reference", even though it is not the double sided Reference Card. This may cause some issues, but am unsure how to resolve this.
- The card text on the actual Hidden Witch is primarily to point to the Reference card text and to establish that the text on Hidden Witch does not actually change when it is revealed. The text is set when revealed and stays the same until no longer revealed.
- The state of "being revealed" is kinda vague to me, but I am under the impression that cards that are set aside remain revealed, so the retention of card text and card types should not be too much of a hassle.
- Hidden Witch is not considered revealed when in it's Kingdom stack, so when your Reference for it is Crone, the Hidden Witch cards in the Kingdom are considered "Night - Attack - Reference" cards, so trashing a Squire can get you a Hidden Witch at that time. This may need to be added to the text of Hidden Witch, idk.
As I said at the beginning I am not sure this actually even works. This is a really tough design challenge and I wanted to try something fancy. This is more of a proof of concept as I think this has a wide-open design space. Please let me know if this makes sense. Feedback and criticism is more then welcome.
Edit: Changed price to $4.
Edit 2: Working on a new post for this with cleaned up cards and rules. Ignore this entry.