Most played cards in Rock and Nail:

2 Decks
Sensei's Divining Top
8 copies - 4 average
Search for Tomorrow
8 copies - 4 average
Pernicious Deed
8 copies - 4 average
Urborg, Tomb of Yawgmoth
8 copies - 4 average
Windswept Heath
8 copies - 4 average
Meddling Mage
8 copies - 4 average
Loxodon Hierarch
8 copies - 4 average
Living Wish
8 copies - 4 average
Sakura-Tribe Elder
8 copies - 4 average
Collective Restraint
8 copies - 4 average
Duress
8 copies - 4 average
Sundering Titan
6 copies - 3 average
Tooth and Nail
6 copies - 3 average
Cabal Coffers
6 copies - 3 average
Overgrown Tomb
4 copies - 2 average
Wooded Foothills
4 copies - 2 average
Breeding Pool
4 copies - 2 average
Moment's Peace
4 copies - 2 average
Platinum Angel
4 copies - 2 average
Aven Mindcensor
2 copies - 1 average