Most played cards in UW Control:

1 Decks
Swords to Plowshares
4 copies - 4 average
Serendib Efreet
4 copies - 4 average
Disenchant
4 copies - 4 average
Counterspell
4 copies - 4 average
Mishra's Factory
4 copies - 4 average
Savannah Lions
4 copies - 4 average
Tundra
4 copies - 4 average
Blue Elemental Blast
3 copies - 3 average
City of Brass
2 copies - 2 average
City in a Bottle
2 copies - 2 average
Underground Sea
2 copies - 2 average
Black Vise
2 copies - 2 average
Psionic Blast
2 copies - 2 average
Serra Angel
2 copies - 2 average
Maze of Ith
2 copies - 2 average
Power Sink
2 copies - 2 average
Divine Offering
2 copies - 2 average
Circle of Protection: Red
2 copies - 2 average
Control Magic
2 copies - 2 average
Braingeyser
1 copies - 1 average