Most played cards in Grixis Harmless Pact:

1 Decks
Demonic Pact
4 copies - 4 average
Oath of Chandra
4 copies - 4 average
Shivan Reef
4 copies - 4 average
Smoldering Marsh
4 copies - 4 average
Radiant Flames
3 copies - 3 average
Languish
3 copies - 3 average
Harmless Offering
3 copies - 3 average
Dark Petition
3 copies - 3 average
Pick the Brain
3 copies - 3 average
Anticipate
3 copies - 3 average
Choked Estuary
3 copies - 3 average
Sunken Hollow
3 copies - 3 average
Oath of Jace
3 copies - 3 average
Transgress the Mind
2 copies - 2 average
Jace, Vryn's Prodigy
2 copies - 2 average
Negate
2 copies - 2 average
Duress
2 copies - 2 average
Grasp of Darkness
2 copies - 2 average
Evolving Wilds
2 copies - 2 average
Disperse
2 copies - 2 average