Most played cards in Boros:

2 Decks
Combustible Gearhulk
4 copies - 2 average
Chandra, Torch of Defiance
4 copies - 2 average
Inspiring Vantage
4 copies - 2 average
Cast Out
4 copies - 2 average
Stone Quarry
4 copies - 2 average
Regal Caracal
4 copies - 2 average
Abrade
4 copies - 2 average
Sweltering Suns
4 copies - 2 average
Magma Spray
4 copies - 2 average
Approach of the Second Sun
4 copies - 2 average
Azor's Gateway
4 copies - 2 average
Chandra's Defeat
3 copies - 1.5 average
Silent Gravestone
3 copies - 1.5 average
Angel of Sanctions
2 copies - 1 average
Scavenger Grounds
2 copies - 1 average
Field of Ruin
2 copies - 1 average
Settle the Wreckage
2 copies - 1 average
Renewed Faith
2 copies - 1 average
Sunbird's Invocation
1 copies - 0.5 average
Thaumatic Compass
1 copies - 0.5 average