Most played cards in Chandra, Fire of Kaladesh:

4 Decks
Incinerate
4 copies - 1 average
Lightning Bolt
4 copies - 1 average
Lightning Strike
4 copies - 1 average
Magma Jet
4 copies - 1 average
Flame Javelin
4 copies - 1 average
Dead // Gone
4 copies - 1 average
Burst Lightning
4 copies - 1 average
Char
4 copies - 1 average
Collective Defiance
4 copies - 1 average
Price of Progress
4 copies - 1 average
Fireblast
4 copies - 1 average
Sudden Shock
4 copies - 1 average
Chandra, Torch of Defiance
4 copies - 1 average
Koth of the Hammer
4 copies - 1 average
Ruby Medallion
4 copies - 1 average
Sulfuric Vortex
4 copies - 1 average
Chandra, Pyromaster
4 copies - 1 average
Blood Moon
4 copies - 1 average
Stromkirk Noble
4 copies - 1 average
Sweltering Suns
4 copies - 1 average