I made some rankings based on
Markus' statistics, using the winner's gain percentage (or buy percentage in the case of projects/events), and I'm going to compare them to the Qvist rankings.
Using winner's gain/buy percentage, the top ten cards are: Governor, Wharf, Mountebank, Hunting Party, Recruiter, Vampire, Counterfeit, Butcher, Cultist, Margrave.
The bottom ten cards are (from bottom to top): Stash, Counting House, Harvest, Mandarin, Cache, Contraband, Royal Seal, Raid, Merchant Ship, Pillage.
Now to compare the "Markus" rankings based on winner's gain percentage, and Qvist rankings. The top three winners in the Markus rankings are:
Market - Qvist 78, Markus 20, 76% gain
Festival - Qvist 74, Markus 27, 74% gain
Forum - Qvist 59, Markus 13, 80% gain
And the top five losers are:
Rebuild - Qvist 45, Markus 90, 44% gain
Torturer - Qvist 8, Markus 45, 65% gain
Catacombs - Qvist 51, Markus 87, 47% gain
Scholar - Qvist 76, Markus 111, 30% gain
Rabble - Qvist 48, Markus 82, 48% gain
In general it seems like harmless cantrips and non-terminals do better in the Markus rankings compared to the Qvist rankings, and terminal draw does worse. This makes sense, and does not mean that the cards are necessarily ranked incorrectly. So I looked around for more interesting outliers. Here are some winners:
Ball - Qvist 79, Markus 46, 65% buy
Tormentor - Qvist 93, Markus 67, 55% gain
Sacred Grove - Qvist 96, Markus 74, 50% gain
Mint - Qvist 92, Markus 72, 52% gain
And losers:
Swamp Hag - Qvist 50, Markus 83, 47% gain
Fleet - Qvist 52, Markus 81, 48% buy
Count - Qvist 35, Markus 64, 57% gain
Junk Dealer - Qvist 13, Markus 28, 74% gain
Groundskeeper - Qvist 22, Markus 36, 69% gain