Most played cards in UW Midrange:

3 Decks
Tundra
12 copies – 4 avg
Swords to Plowshares
12 copies – 4 avg
Disenchant
12 copies – 4 avg
City of Brass
9 copies – 3 avg
Jayemdae Tome
9 copies – 3 avg
Counterspell
9 copies – 3 avg
Serra Angel
9 copies – 3 avg
Mishra's Factory
8 copies – 2.67 avg
Volcanic Island
6 copies – 2 avg
Fellwar Stone
6 copies – 2 avg
Lightning Bolt
6 copies – 2 avg
Serendib Efreet
6 copies – 2 avg
Savannah Lions
6 copies – 2 avg
Plateau
5 copies – 1.67 avg
Divine Offering
5 copies – 1.67 avg
Control Magic
5 copies – 1.67 avg
Su-Chi
4 copies – 1.33 avg
Blue Elemental Blast
4 copies – 1.33 avg
Red Elemental Blast
4 copies – 1.33 avg
Icatian Javelineers
4 copies – 1.33 avg