Most played cards in Marchesa, the Black Rose:

2 Decks
Darkslick Shores
2 copies - 1 average
Oona's Blackguard
2 copies - 1 average
Baleful Strix
2 copies - 1 average
Temple of Epiphany
2 copies - 1 average
Creeping Tar Pit
2 copies - 1 average
Sulfur Falls
2 copies - 1 average
City of Brass
2 copies - 1 average
Sunken Ruins
2 copies - 1 average
Duress
2 copies - 1 average
Preordain
2 copies - 1 average
Dismember
2 copies - 1 average
Go for the Throat
2 copies - 1 average
Terminate
2 copies - 1 average
Thoughtseize
2 copies - 1 average
Hymn to Tourach
2 copies - 1 average
Rolling Earthquake
2 copies - 1 average
Dreadbore
2 copies - 1 average
Bloodstained Mire
2 copies - 1 average
Shivan Reef
2 copies - 1 average
Drowned Catacomb
2 copies - 1 average