I tried designing a kingdom with Rebuild and 9 other Dark Ages cards that would be interesting. This is my first revision:
(Shelters and Provinces, no landscapes)
Would you consider this kingdom interesting to play (and also: fun)? If an interesting Rebuild kingdom (100% Dark Ages) is something that exists in your world, could this be made more interesting, and if so how?
My design process is not particularly sophisticated: pick Rebuild, then pick all the cards that interact with how a normal Rebuild game plays out.
Trashing non-Rebuild cards increases your Rebuild density and trashing your money density up to $1 increases your Rebuild and Duchy gain rate. Junking un-trashes your opponent. Scavenger and Pillage do card (de-)selection, Market Square and Rogue interact with the trash(ing). You know, "+$2, gain a Duchy" is great. Feodum gives Overgrown Estate two paths along which it can be promoted into Duchy, and Squire lets you gain the expensive attacks without Rebuild or Duchy being part of the opportunity cost. Death Cart might give you Province money, and if 2xMarauder pile the ruins it's nice to gain. Squire/Feodum with Rogue support might let Rebuild play a non-mirror for once. Is Rebuild/Feodum a thing?
The missus and I had fun playing the kingdom and I found it interesting, so mission success, mostly. I have been underwhelmed by Marauder and Death Cart; everything else played roughly how I expected. Maybe I'm underestimating Marauder, though? Forager is happy to trash the ruins, but making $1 off of two cards makes it hard(er) to hit $5.
The card selection effect of Scavenger is very overt.
Sage and
Wandering Minstrel are more indirect in their Rebuild-finding effects, and maybe more interesting but perhaps also clumsy enough that they won't see play? Sage will find a lot of non-Rebuild cards and Wandering Minstrel will help your terminals collide. Maybe making them work is an interesting challenge? I think not, but it seems worth experimenting with.
I think
Poor House might be a worthwhile Death Cart replacement in v2 of the kingdom. It'll help you hit $5 with support (Silver, Forager, Squire), but at the cost of terminal space; it might be easy to pick up off a spare Forager buy.
Anyways, I've rambled enough. Would you find the kingdom interesting and fun to play?