Most played cards in U/W Control:

3 Decks
Wrath of God
12 copies - 4 average
Condemn
11 copies - 3.67 average
Court Hussar
11 copies - 3.67 average
Hallowed Fountain
10 copies - 3.33 average
Azorius Signet
8 copies - 2.67 average
Faith's Fetters
8 copies - 2.67 average
Compulsive Research
8 copies - 2.67 average
Azorius Chancery
8 copies - 2.67 average
Adarkar Wastes
8 copies - 2.67 average
Aeon Chronicler
7 copies - 2.33 average
Careful Consideration
7 copies - 2.33 average
Tormod's Crypt
7 copies - 2.33 average
Cancel
7 copies - 2.33 average
Spell Snare
6 copies - 2 average
6 copies - 2 average
Urza's Factory
5 copies - 1.67 average
Teferi, Mage of Zhalfir
5 copies - 1.67 average
Nimbus Maze
5 copies - 1.67 average
Snow-Covered Island
5 copies - 1.67 average
Story Circle
4 copies - 1.33 average