I had no idea, really. Mountebank is generally a better card than Soothsayer, but if you make the AI prefer Mountebank that exaggerates the difference. I actually added this so that I could compare Mountebank and Soothsayer, so I didn't want to introduce a false preference. So, maybe just use Qvist's rankings? It should be slightly more valuable than Haggler, but substantially less valuable than Margrave. 

So, 200? But 200 is for playing a non-terminal Smithy, which should probably be preferred over a Soothsayer if you have actions to spare. So 199, I suppose. I'll make that change.