Most played cards in The Rock:

1 Decks
Lingering Souls
4 copies - 4 average
Verdant Catacombs
4 copies - 4 average
Tarmogoyf
4 copies - 4 average
Blooming Marsh
4 copies - 4 average
Liliana of the Veil
3 copies - 3 average
Fatal Push
3 copies - 3 average
Stony Silence
3 copies - 3 average
Marsh Flats
3 copies - 3 average
Fulminator Mage
3 copies - 3 average
Thoughtseize
3 copies - 3 average
Path to Exile
3 copies - 3 average
Collective Brutality
3 copies - 3 average
Noble Hierarch
3 copies - 3 average
Grim Flayer
3 copies - 3 average
Inquisition of Kozilek
3 copies - 3 average
Gideon, Ally of Zendikar
2 copies - 2 average
Shambling Vent
2 copies - 2 average
Windswept Heath
2 copies - 2 average
Siege Rhino
2 copies - 2 average
Scavenging Ooze
2 copies - 2 average