Most played cards in :

3 Decks
Swords to Plowshares
8 copies - 2.67 average
Disenchant
8 copies - 2.67 average
Mishra's Factory
6 copies - 2 average
City of Brass
6 copies - 2 average
Tundra
4 copies - 1.33 average
Tropical Island
4 copies - 1.33 average
Plateau
4 copies - 1.33 average
Savannah
4 copies - 1.33 average
Lightning Bolt
4 copies - 1.33 average
Birds of Paradise
4 copies - 1.33 average
Millstone
4 copies - 1.33 average
Wrath of God
4 copies - 1.33 average
Counterspell
4 copies - 1.33 average
Divine Offering
3 copies - 1 average
Whirling Dervish
3 copies - 1 average
Maze of Ith
3 copies - 1 average
Serra Angel
3 copies - 1 average
Red Elemental Blast
3 copies - 1 average
Mana Vault
3 copies - 1 average
Giant Spider
3 copies - 1 average