It seems really odd to me that Royal Seal and Watchtower were both in the same set. Royal Seal makes sense, fitting the Treasure theme. Watchtower could have easily fit into a different set, perhaps Seaside (topdecking impacts the next turn) or even Hinterlands (on-gain synergy) or Dark Ages (on-trash synergy). Putting Watchtower in Dark Ages would have let us appreciate Royal Seal more, I think.