Most played cards in Elemental:

1 Decks
Risen Reef
4 copies - 4 average
Lightning Skelemental
4 copies - 4 average
Simian Spirit Guide
4 copies - 4 average
Thunderkin Awakener
4 copies - 4 average
Chalice of the Void
4 copies - 4 average
Chancellor of the Tangle
4 copies - 4 average
Seasoned Pyromancer
4 copies - 4 average
Mana Confluence
4 copies - 4 average
Cavern of Souls
4 copies - 4 average
Collected Company
3 copies - 3 average
Smokebraider
3 copies - 3 average
Fulminator Mage
3 copies - 3 average
Kolaghan's Command
3 copies - 3 average
Voice of Resurgence
3 copies - 3 average
Unclaimed Territory
3 copies - 3 average
Wooded Foothills
3 copies - 3 average
Veil of Summer
2 copies - 2 average
Surgical Extraction
2 copies - 2 average
Fry
2 copies - 2 average
Vesperlark
2 copies - 2 average