Just traded Priesthood from Mansa Musa the turn after he invented it. I'm thinking of building the Oracle now. The thing is I'm neither Industrious nor have access to Marble but the fact that no other AI has invented Priesthood yet might make it possible for me to finish it first. I play on Deity so it's hard but if I chop down some trees it might work. So the big threat is Mansa Munsa who might start building it at the same time as me. I therefore wonder if the fact that he was willing to trade it to me means that he is not building it?