Most played cards in R/G Beats:

5 Decks
Grove of the Burnwillows
20 copies - 4 average
Punishing Fire
20 copies - 4 average
Raging Ravine
20 copies - 4 average
Fire-Lit Thicket
20 copies - 4 average
Vengevine
20 copies - 4 average
Bloodbraid Elf
20 copies - 4 average
Figure of Destiny
20 copies - 4 average
Kitchen Finks
19 copies - 3.8 average
Arid Mesa
18 copies - 3.6 average
Relic of Progenitus
17 copies - 3.4 average
Boggart Ram-Gang
16 copies - 3.2 average
Demigod of Revenge
16 copies - 3.2 average
Lotus Cobra
16 copies - 3.2 average
Kargan Dragonlord
16 copies - 3.2 average
Flame Javelin
16 copies - 3.2 average
Volcanic Fallout
15 copies - 3 average
Sulfur Elemental
13 copies - 2.6 average
12 copies - 2.4 average
Scalding Tarn
11 copies - 2.2 average
Fulminator Mage
4 copies - 0.8 average