Most played cards in Grixis Pyromancer:

1 Decks
Stubborn Denial
4 copies - 4 average
Serum Visions
4 copies - 4 average
Death's Shadow
4 copies - 4 average
Thought Scour
4 copies - 4 average
Thoughtseize
4 copies - 4 average
Bloodstained Mire
4 copies - 4 average
Polluted Delta
4 copies - 4 average
Young Pyromancer
3 copies - 3 average
Ceremonious Rejection
3 copies - 3 average
Street Wraith
3 copies - 3 average
Fatal Push
3 copies - 3 average
Snapcaster Mage
3 copies - 3 average
Scalding Tarn
3 copies - 3 average
Watery Grave
2 copies - 2 average
Terminate
2 copies - 2 average
Nihil Spellbomb
2 copies - 2 average
Liliana of the Veil
2 copies - 2 average
Flaying Tendrils
2 copies - 2 average
Opt
2 copies - 2 average
Gurmag Angler
2 copies - 2 average