Most played cards in Marchesa, the Black Rose:

1 Decks
Fire // Ice
1 copies - 1 average
Fire Covenant
1 copies - 1 average
Fact or Fiction
1 copies - 1 average
Duress
1 copies - 1 average
Dismember
1 copies - 1 average
Force Spike
1 copies - 1 average
Force of Will
1 copies - 1 average
Kolaghan's Command
1 copies - 1 average
Into the Roil
1 copies - 1 average
Inquisition of Kozilek
1 copies - 1 average
Gitaxian Probe
1 copies - 1 average
Dig Through Time
1 copies - 1 average
Demonic Tutor
1 copies - 1 average
True-Name Nemesis
1 copies - 1 average
Spellskite
1 copies - 1 average
Snapcaster Mage
1 copies - 1 average
Phyrexian Revoker
1 copies - 1 average
Vendilion Clique
1 copies - 1 average
Venser, Shaper Savant
1 copies - 1 average
Daze
1 copies - 1 average