Most played cards in Gifts Rock:

1 Decks
Polluted Delta
4 copies - 4 average
Windswept Heath
4 copies - 4 average
Brainstorm
4 copies - 4 average
Tarmogoyf
4 copies - 4 average
Birds of Paradise
4 copies - 4 average
Extirpate
3 copies - 3 average
Circle of Protection: Red
3 copies - 3 average
Thoughtseize
3 copies - 3 average
Gifts Ungiven
3 copies - 3 average
Swords to Plowshares
3 copies - 3 average
Infest
3 copies - 3 average
Meddling Mage
3 copies - 3 average
Krosan Grip
3 copies - 3 average
Eternal Witness
3 copies - 3 average
Cabal Therapy
3 copies - 3 average
Doran, the Siege Tower
2 copies - 2 average
Tombstalker
2 copies - 2 average
Bayou
2 copies - 2 average
Vindicate
1 copies - 1 average
Volrath's Stronghold
1 copies - 1 average