Thanks to ceviri and his
tool, I got some logs from the new client since the Nocturne release. There are about 1100 logs that feature either me (75%) or RTT as a player.
The small sample means that you can expect some outliers for random reasons, but the results look fine enough to me that I'm posting them. You can find them
here.
Small sample also means that I'm calculating the impact factor a bit differently than trivialknot, but the idea is still to see how much the buy% or gain% of other cards changes in absolute terms when card/event/landmark X is on the board. Results are normalized to have mean 0 and standard deviation 1.
One thing to note is that a card being on the bottom means that it doesn't affect the chance that at least one of the players buys/gains the other cards much. That could be, because it's a dud as for many cards in the original list. Or because it doesn't affect the average strategy much.
Probably, Herald is at the bottom for random reasons. But you could make a case that with Herald on the board you often play it the same as "on average" and you gain some Heralds in addition.
PS: There's a bunch of other stuff, I've been calculating with those logs, which you can find on the other sheets. Feel free to ask, if there are any questions.