Most played cards in Rogue:

3 Decks
Wasteland
12 copies - 4 average
Swords to Plowshares
8 copies - 2.67 average
Mishra's Factory
6 copies - 2 average
Marsh Flats
5 copies - 1.67 average
Liliana of the Veil
5 copies - 1.67 average
Ghostly Prison
4 copies - 1.33 average
Flooded Strand
4 copies - 1.33 average
Hymn to Tourach
4 copies - 1.33 average
Oblivion Ring
4 copies - 1.33 average
Perish
4 copies - 1.33 average
Smokestack
4 copies - 1.33 average
Chalice of the Void
4 copies - 1.33 average
Tangle Wire
4 copies - 1.33 average
Smallpox
4 copies - 1.33 average
Trinisphere
4 copies - 1.33 average
Mox Diamond
4 copies - 1.33 average
Flagstones of Trokair
4 copies - 1.33 average
Force of Will
4 copies - 1.33 average
Brainstorm
4 copies - 1.33 average
Bloodstained Mire
4 copies - 1.33 average