Most played cards in UW Control:

2 Decks
Contagion Clasp
8 copies - 4 average
Seachrome Coast
8 copies - 4 average
Stoic Rebuttal
8 copies - 4 average
Tumble Magnet
7 copies - 3.5 average
Revoke Existence
6 copies - 3 average
Elspeth Tirel
6 copies - 3 average
Arrest
6 copies - 3 average
Sunblast Angel
5 copies - 2.5 average
Volition Reins
4 copies - 2 average
Mirran Crusader
4 copies - 2 average
Inkmoth Nexus
4 copies - 2 average
Glimmerpoint Stag
4 copies - 2 average
Origin Spellbomb
4 copies - 2 average
Divine Offering
4 copies - 2 average
Steel Sabotage
4 copies - 2 average
Venser, the Sojourner
3 copies - 1.5 average
Turn Aside
3 copies - 1.5 average
Leonin Relic-Warder
3 copies - 1.5 average
Consecrated Sphinx
3 copies - 1.5 average
Neurok Commando
3 copies - 1.5 average