If there was trashing, yes. The Scrying Pool engine would be very strong against the Feodum player, because it would probably play 3-4 Thieves per turn. But, like this... i don't think it is. Expand can trash, but it won't do much. It also looks too slow to be set up. Seems to me that, by the time this engine will start kicking, the Feodum player will already be raking the Silvers and will have bought at least half of the Feoda.
Masterpiece-Feodum definitely looks like the best choice on this board. Watchtower also synegizes very well with Masterpiece: Just buy a Masterpiece with a Watchtower in hand and you will realise the awesomeness
(Watchtower-trash the Masterpiece, Watchtower- top-deck the Silvers gained, buy good stuff next turn -probably another Masterpiece in this case).