Most played cards in The Rock:

1 Decks
Swords to Plowshares
4 copies - 4 average
Dark Ritual
4 copies - 4 average
Juzam Djinn
4 copies - 4 average
Avoid Fate
4 copies - 4 average
City of Brass
4 copies - 4 average
Scrubland
4 copies - 4 average
Bayou
4 copies - 4 average
Mishra's Factory
4 copies - 4 average
Hypnotic Specter
4 copies - 4 average
Sinkhole
4 copies - 4 average
Black Knight
4 copies - 4 average
Disenchant
4 copies - 4 average
Underworld Dreams
4 copies - 4 average
Argothian Pixies
3 copies - 3 average
Sylvan Library
2 copies - 2 average
Circle of Protection: Red
2 copies - 2 average
Tsunami
1 copies - 1 average
Maze of Ith
1 copies - 1 average
Balance
1 copies - 1 average
Drain Life
1 copies - 1 average