Most played cards in R/G Beats:

2 Decks
Mogg Fanatic
8 copies - 4 average
Rift Bolt
8 copies - 4 average
Stomping Ground
8 copies - 4 average
Kird Ape
8 copies - 4 average
Tarmogoyf
8 copies - 4 average
Wooded Foothills
7 copies - 3.5 average
Pyrostatic Pillar
6 copies - 3 average
Tin Street Hooligan
5 copies - 2.5 average
Blood Moon
5 copies - 2.5 average
Shattering Spree
4 copies - 2 average
Martyr of Ashes
4 copies - 2 average
Wild Nacatl
4 copies - 2 average
Karplusan Forest
4 copies - 2 average
Blistering Firecat
4 copies - 2 average
Flame Javelin
4 copies - 2 average
Bloodstained Mire
4 copies - 2 average
Mutavault
4 copies - 2 average
Keldon Marauders
4 copies - 2 average
Seal of Fire
4 copies - 2 average
Incinerate
4 copies - 2 average