I was just thinking about how to distinguish this from Bless Lands, and how to keep it from being something that's just routinely cast anywhere it's profitable or never cast at all, and that question combined in my head with Niels' comment about flavor options. If we cast this as a spell that lets merchants/guilds take advantage of folks a bit, what if we make it reasonably profitable for the guilds, well worth arranging for, but reduce Prosperity by 1 in that province for each casting as the locals slowly start getting angry at being gouged? Maybe it makes people a bit more gullible, maybe it just helps the guilders predict what will be in short supply so they can monopolize it, but it provides them with profits at a long-term cost. So now the province becomes a sheep, not an orchard - a guild can either shear it every year or so, reaping profits then letting the prosperity recover, or they can run the place into the ground for several seasons in a row to rack up a significant war chest at the province's expense. It'd add to the conflicts between landed rulers and guilders that seem to be a recurring theme here, which might appeal to our benevolent DMs, too - not only would the rulers be unhappy at having an unhappy province, if they can't stop the spell, they'll have to reduce taxes to compensate for the Prosperity losses. What do you guys think?