Most played cards in UW Control:

1 Decks
Dream Stalker
4 copies - 4 average
Counterspell
4 copies - 4 average
Azorius Chancery
4 copies - 4 average
Preordain
4 copies - 4 average
Tranquil Cove
4 copies - 4 average
Hydroblast
4 copies - 4 average
Spreading Seas
4 copies - 4 average
Thraben Inspector
4 copies - 4 average
Mulldrifter
4 copies - 4 average
Kor Skyfisher
4 copies - 4 average
Sunlance
3 copies - 3 average
Kabira Crossroads
3 copies - 3 average
Lone Missionary
3 copies - 3 average
Faith's Fetters
2 copies - 2 average
Prismatic Strands
2 copies - 2 average
Oblivion Ring
2 copies - 2 average
Serrated Arrows
2 copies - 2 average
Reality Acid
2 copies - 2 average
Kor Sanctifiers
1 copies - 1 average
Relic of Progenitus
1 copies - 1 average