In the Dominaria United set the 3 masterpieces - Urza’s factory, Mine, and power plant work together. They have effects that work with how many other “Urza’s” cards you have in play. Do these work with other Urza’s cards outside of the 3? Eg ( Urza’s fun house, Urza’s saga?)
Yes, the 3 Dominaria United masterpieces work with both Fun House and Saga.