Most played cards in Rogue:

5 Decks
Lightning Bolt
15 copies - 3 average
Mishra's Factory
14 copies - 2.8 average
Volcanic Island
14 copies - 2.8 average
Tropical Island
11 copies - 2.2 average
Red Elemental Blast
11 copies - 2.2 average
Chain Lightning
11 copies - 2.2 average
Disenchant
11 copies - 2.2 average
Blue Elemental Blast
10 copies - 2 average
Swords to Plowshares
10 copies - 2 average
City of Brass
9 copies - 1.8 average
Taiga
8 copies - 1.6 average
Howling Mine
7 copies - 1.4 average
Strip Mine
7 copies - 1.4 average
Circle of Protection: Red
6 copies - 1.2 average
Tundra
6 copies - 1.2 average
Plateau
5 copies - 1 average
Energy Flux
5 copies - 1 average
Chaos Orb
5 copies - 1 average
Tranquility
5 copies - 1 average
Black Vise
5 copies - 1 average