Most played cards in Grixis Pact:

1 Decks
Galvanic Bombardment
4 copies - 4 average
Demonic Pact
4 copies - 4 average
Fevered Visions
4 copies - 4 average
Take Inventory
4 copies - 4 average
Oath of Jace
3 copies - 3 average
Negate
3 copies - 3 average
Dark Petition
3 copies - 3 average
Languish
3 copies - 3 average
Ruinous Path
3 copies - 3 average
Orbs of Warding
3 copies - 3 average
Grasp of Darkness
3 copies - 3 average
Evolving Wilds
3 copies - 3 average
Disperse
3 copies - 3 average
Smoldering Marsh
3 copies - 3 average
Sunken Hollow
3 copies - 3 average
Wandering Fumarole
3 copies - 3 average
Choked Estuary
3 copies - 3 average
Summary Dismissal
2 copies - 2 average
Foreboding Ruins
2 copies - 2 average
Infinite Obliteration
2 copies - 2 average