Tapestry
Can Architects gained mid-game swap income buildings on a Craftsmen mat, and how many swaps do you get?
Yes. Income buildings on the Craftsmen mat count as part of your capital city, so they can be swapped. Each swap exchanges one income building for another, and you may swap up to three times. Swapping does not regain the Craftsmen mat's benefits, and buildings the Nomads place on the map cannot be swapped.