Most
$6 - Goons (96.2%), Border Village (93.3%)
$5 - Mountebank (91.7%)
$4 - Worker's Village (94.7%), Caravan (94.6%), Farming Village (90.6%)
$3p - Familiar (92.5%)
$3 - Fishing Village (94.1%)
$2 - Chapel (92.7%), Crossroads (89.7%)
GOONS ENGINE, WITCHES! Too bad Caravan is the only real source of +Cards. Also, apparently I buy a lot of villages (although only Border Village and Crossroads show evidence of me buying them too much).
Least (ignoring Archivist and prizes)
$5 - Horn of Plenty (7%), Counting House (4.5%), Harvest (4.3%), Explorer (4.2%), Contraband (4.0%)
$4 - Coppersmith (6.9%), Bureaucrat (6.8%), Thief (5.8%), Navigator (1.7%)
$3 - Chancellor (7.7%)
AKA, a bunch of terrible cards and I have no idea how to use Horn of Plenty. Big Money it is. Maybe Navigator/BM or Explorer/BM (depending on starting split).