Most played cards in 5C Midrange:

2 Decks
Lightning Bolt
8 copies - 4 average
City of Brass
8 copies - 4 average
Disenchant
7 copies - 3.5 average
Swords to Plowshares
7 copies - 3.5 average
Red Elemental Blast
6 copies - 3 average
Badlands
4 copies - 2 average
Hymn to Tourach
4 copies - 2 average
Hypnotic Specter
4 copies - 2 average
The Rack
4 copies - 2 average
Sedge Troll
4 copies - 2 average
Su-Chi
4 copies - 2 average
Birds of Paradise
4 copies - 2 average
Bayou
4 copies - 2 average
Volcanic Island
4 copies - 2 average
Tropical Island
4 copies - 2 average
Counterspell
3 copies - 1.5 average
Fellwar Stone
3 copies - 1.5 average
Erhnam Djinn
3 copies - 1.5 average
Earthquake
3 copies - 1.5 average
Underworld Dreams
3 copies - 1.5 average