Most played cards in The Rock:

1 Decks
Llanowar Wastes
4 copies - 4 average
Llanowar Elves
4 copies - 4 average
Thoughtseize
4 copies - 4 average
Treetop Village
4 copies - 4 average
Wren's Run Vanquisher
4 copies - 4 average
Kitchen Finks
4 copies - 4 average
Profane Command
4 copies - 4 average
Gilt-Leaf Palace
4 copies - 4 average
Chameleon Colossus
4 copies - 4 average
Terror
3 copies - 3 average
Troll Ascetic
3 copies - 3 average
Incremental Blight
3 copies - 3 average
Cloudthresher
3 copies - 3 average
Bitterblossom
3 copies - 3 average
Snakeform
3 copies - 3 average
Mind Shatter
2 copies - 2 average
Relic of Progenitus
2 copies - 2 average
Civic Wayfinder
2 copies - 2 average
Mutavault
2 copies - 2 average
Twilight Mire
2 copies - 2 average