Surprised no one has put Black Market and Crown together. Crowning a Black Market while buying from another Black Market seems like one of the best tracking nightmares available.
I seem to remember a thread about this, but I don't remember what the ruling was
- Play Black Market, get $2, reveal 3 cards from the BM deck (set A)
-- play a Crown
--- play Black Market, get $2, reveal 3 new cards (set B)
---- play other treasures in your hand for $
---- buy (or not) a card from set B, lose (or not) some $, return set B to the bottom
--- play Black Market a second time, get $2, reveal 3 new cards (set C)
---- play other treasures in your hand for $
---- buy (or not) a card from set C, lose (or not) some $, return set Cto the bottom
-- play other treasures in your hand for $
-- buy (or not) a card from set A, lose (or not) some $, return set A to the bottom
For added fun, replace any of the "other treasures for $" with "more Crowns, Black Markets, and Storytellers".
edit: also I think Villa is a nice fit for a nightmare intro kingdom.