Most played cards in Burn:

5 Decks
Jackal Pup
20 copies - 4 average
Fireblast
20 copies - 4 average
Cursed Scroll
20 copies - 4 average
Lightning Bolt
20 copies - 4 average
Incinerate
20 copies - 4 average
Grim Lavamancer
19 copies - 3.8 average
Wooded Foothills
18 copies - 3.6 average
Ball Lightning
18 copies - 3.6 average
Bloodstained Mire
16 copies - 3.2 average
Mogg Fanatic
16 copies - 3.2 average
Sulfuric Vortex
13 copies - 2.6 average
Barbarian Ring
11 copies - 2.2 average
Pyroblast
9 copies - 1.8 average
Price of Progress
9 copies - 1.8 average
Red Elemental Blast
9 copies - 1.8 average
Black Vise
8 copies - 1.6 average
Flame Rift
8 copies - 1.6 average
Anarchy
6 copies - 1.2 average
Seal of Fire
5 copies - 1 average
Tormod's Crypt
4 copies - 0.8 average