Most played cards in The Rock:

2 Decks
Oath of Nissa
8 copies - 4 average
Dromoka's Command
8 copies - 4 average
Fortified Village
8 copies - 4 average
Gideon, Ally of Zendikar
8 copies - 4 average
Canopy Vista
8 copies - 4 average
Sylvan Advocate
8 copies - 4 average
Nissa, Voice of Zendikar
8 copies - 4 average
Archangel Avacyn
8 copies - 4 average
Hangarback Walker
7 copies - 3.5 average
Declaration in Stone
6 copies - 3 average
Den Protector
5 copies - 2.5 average
Nissa, Vastwood Seer
4 copies - 2 average
Planar Outburst
4 copies - 2 average
Westvale Abbey
4 copies - 2 average
Linvala, the Preserver
3 copies - 1.5 average
Evolutionary Leap
3 copies - 1.5 average
Stasis Snare
3 copies - 1.5 average
Secure the Wastes
3 copies - 1.5 average
Lambholt Pacifist
2 copies - 1 average
Tragic Arrogance
2 copies - 1 average