Most played cards in Smallpox:

3 Decks
Stupor
12 copies - 4 average
Tendrils of Corruption
12 copies - 4 average
Smallpox
12 copies - 4 average
The Rack
11 copies - 3.67 average
Damnation
11 copies - 3.67 average
Sudden Death
10 copies - 3.33 average
Augur of Skulls
8 copies - 2.67 average
Phyrexian Totem
8 copies - 2.67 average
Korlash, Heir to Blackblade
8 copies - 2.67 average
Funeral Charm
6 copies - 2 average
Mindstab
5 copies - 1.67 average
Tombstalker
5 copies - 1.67 average
Snapback
4 copies - 1.33 average
Plague Sliver
4 copies - 1.33 average
Grave Peril
4 copies - 1.33 average
Dodecapod
4 copies - 1.33 average
Death Rattle
3 copies - 1 average
3 copies - 1 average
Teferi, Mage of Zhalfir
3 copies - 1 average
Body Double
3 copies - 1 average