Most played cards in Rogue:

5 Decks
Brainstorm
12 copies - 2.4 average
Chrome Mox
9 copies - 1.8 average
Meddling Mage
8 copies - 1.6 average
8 copies - 1.6 average
Shivan Reef
8 copies - 1.6 average
Fire // Ice
8 copies - 1.6 average
Enlightened Tutor
8 copies - 1.6 average
Stifle
7 copies - 1.4 average
Erratic Explosion
7 copies - 1.4 average
City of Traitors
6 copies - 1.2 average
Isochron Scepter
6 copies - 1.2 average
Scroll Rack
5 copies - 1 average
Adarkar Wastes
5 copies - 1 average
Energy Flux
5 copies - 1 average
Counterspell
5 copies - 1 average
Anurid Brushhopper
4 copies - 0.8 average
Brushland
4 copies - 0.8 average
Birds of Paradise
4 copies - 0.8 average
Arrogant Wurm
4 copies - 0.8 average
Basking Rootwalla
4 copies - 0.8 average