I only know of the term Golden Sombrero from baseball - it is when a batter strikes out 4 times in the same game, a relatively rare but ignominious accomplishment. I don't really care for its application here - in baseball, it's indicative of poor performance, but in Dominion, it would be indicative of bad shuffle luck? A Golden Sombrero in Dominion to me would be like being a Village or (if you're a bot on Goko) Warehouse Idiot.