Most played cards in UW Control:

5 Decks
Hydroblast
14 copies - 2.8 average
Preordain
12 copies - 2.4 average
Tireless Tribe
12 copies - 2.4 average
Shadow Rift
12 copies - 2.4 average
Gitaxian Probe
12 copies - 2.4 average
Inside Out
12 copies - 2.4 average
Ponder
11 copies - 2.2 average
Gush
11 copies - 2.2 average
Augur of Bolas
10 copies - 2 average
Evolving Wilds
9 copies - 1.8 average
Circular Logic
9 copies - 1.8 average
Dispel
9 copies - 1.8 average
Standard Bearer
8 copies - 1.6 average
Ash Barrens
7 copies - 1.4 average
Lone Missionary
7 copies - 1.4 average
Brainstorm
7 copies - 1.4 average
Daze
6 copies - 1.2 average
Beckon Apparition
6 copies - 1.2 average
Gigadrowse
6 copies - 1.2 average
Piracy Charm
6 copies - 1.2 average