Most played cards in Burn:

2 Decks
Skullcrack
10 copies - 5 average
Boros Charm
8 copies - 4 average
Monastery Swiftspear
8 copies - 4 average
Lightning Bolt
8 copies - 4 average
Rift Bolt
8 copies - 4 average
Skewer the Critics
8 copies - 4 average
Goblin Guide
8 copies - 4 average
Lava Spike
8 copies - 4 average
Sunbaked Canyon
8 copies - 4 average
Eidolon of the Great Revel
8 copies - 4 average
Smash to Smithereens
7 copies - 3.5 average
Inspiring Vantage
7 copies - 3.5 average
Path to Exile
6 copies - 3 average
Searing Blaze
6 copies - 3 average
Wooded Foothills
6 copies - 3 average
Lightning Helix
5 copies - 2.5 average
Kor Firewalker
5 copies - 2.5 average
Bloodstained Mire
5 copies - 2.5 average
Deflecting Palm
4 copies - 2 average
Sacred Foundry
3 copies - 1.5 average