Most played cards in Burn:

2 Decks
Fireblast
8 copies - 4 average
Jackal Pup
8 copies - 4 average
Cursed Scroll
8 copies - 4 average
Incinerate
8 copies - 4 average
Lightning Bolt
8 copies - 4 average
Ball Lightning
8 copies - 4 average
Grim Lavamancer
7 copies - 3.5 average
Wooded Foothills
6 copies - 3 average
Red Elemental Blast
5 copies - 2.5 average
Bloodstained Mire
4 copies - 2 average
Black Vise
4 copies - 2 average
Barbarian Ring
4 copies - 2 average
Price of Progress
4 copies - 2 average
Tormod's Crypt
4 copies - 2 average
Mogg Fanatic
4 copies - 2 average
Sulfuric Vortex
4 copies - 2 average
Goblin Patrol
4 copies - 2 average
Pyroblast
3 copies - 1.5 average
Boil
3 copies - 1.5 average
Flame Jet
2 copies - 1 average