Most played cards in 5C Midrange:

3 Decks
Lightning Bolt
12 copies - 4 average
City of Brass
12 copies - 4 average
Disenchant
9 copies - 3 average
Swords to Plowshares
9 copies - 3 average
Red Elemental Blast
8 copies - 2.67 average
Volcanic Island
8 copies - 2.67 average
Tropical Island
7 copies - 2.33 average
Counterspell
6 copies - 2 average
Su-Chi
6 copies - 2 average
Erhnam Djinn
5 copies - 1.67 average
Sedge Troll
4 copies - 1.33 average
The Rack
4 copies - 1.33 average
Hypnotic Specter
4 copies - 1.33 average
Earthquake
4 copies - 1.33 average
Hymn to Tourach
4 copies - 1.33 average
Black Vise
4 copies - 1.33 average
Serendib Efreet
4 copies - 1.33 average
Psychic Purge
4 copies - 1.33 average
Birds of Paradise
4 copies - 1.33 average
Divine Offering
4 copies - 1.33 average