Most played cards in Grixis Pyromancer:

1 Decks
Bedlam Reveler
4 copies - 4 average
Polluted Delta
4 copies - 4 average
Thought Scour
4 copies - 4 average
Faithless Looting
4 copies - 4 average
Inquisition of Kozilek
4 copies - 4 average
Bloodstained Mire
4 copies - 4 average
Lightning Bolt
4 copies - 4 average
Young Pyromancer
4 copies - 4 average
Thoughtseize
3 copies - 3 average
Fatal Push
3 copies - 3 average
Surgical Extraction
3 copies - 3 average
Molten Rain
3 copies - 3 average
Kolaghan's Command
3 copies - 3 average
Engineered Explosives
2 copies - 2 average
Jace, the Mind Sculptor
2 copies - 2 average
Collective Brutality
2 copies - 2 average
Steam Vents
2 copies - 2 average
Spirebluff Canal
2 copies - 2 average
Dismember
1 copies - 1 average
Grim Lavamancer
1 copies - 1 average