Most played cards in Smallpox:

1 Decks
Funeral Charm
4 copies - 4 average
The Rack
4 copies - 4 average
Godless Shrine
4 copies - 4 average
Smallpox
4 copies - 4 average
Dark Confidant
4 copies - 4 average
Augur of Skulls
4 copies - 4 average
Caves of Koilos
4 copies - 4 average
Cry of Contrition
4 copies - 4 average
Stupor
3 copies - 3 average
Quagnoth
3 copies - 3 average
Plagued Rusalka
3 copies - 3 average
Ravenous Rats
3 copies - 3 average
Flagstones of Trokair
3 copies - 3 average
Honorable Passage
2 copies - 2 average
Intervention Pact
2 copies - 2 average
Leyline of the Void
2 copies - 2 average
Disenchant
2 copies - 2 average
Withered Wretch
2 copies - 2 average
Urborg, Tomb of Yawgmoth
2 copies - 2 average
Graveborn Muse
2 copies - 2 average