Most played cards in UW Control:

1 Decks
Anticipate
4 copies - 4 average
Prairie Stream
4 copies - 4 average
Myth Realized
4 copies - 4 average
Clash of Wills
4 copies - 4 average
Secure the Wastes
3 copies - 3 average
Reflector Mage
3 copies - 3 average
Planar Outburst
3 copies - 3 average
Spell Shrivel
3 copies - 3 average
Port Town
3 copies - 3 average
Gideon, Ally of Zendikar
3 copies - 3 average
Silkwrap
2 copies - 2 average
Declaration in Stone
2 copies - 2 average
Horribly Awry
2 copies - 2 average
Scatter to the Winds
2 copies - 2 average
Trail of Evidence
2 copies - 2 average
Immolating Glare
2 copies - 2 average
Negate
2 copies - 2 average
Dragonlord Ojutai
2 copies - 2 average
Quarantine Field
1 copies - 1 average
Linvala, the Preserver
1 copies - 1 average