Most played cards in UB Control:

5 Decks
Duress
20 copies - 4 average
Counterspell
20 copies - 4 average
Polluted Delta
20 copies - 4 average
Undermine
17 copies - 3.4 average
Standstill
16 copies - 3.2 average
Mishra's Factory
16 copies - 3.2 average
Underground River
14 copies - 2.8 average
Chill
12 copies - 2.4 average
Force Spike
12 copies - 2.4 average
Impulse
12 copies - 2.4 average
Engineered Plague
10 copies - 2 average
Wasteland
10 copies - 2 average
Smother
10 copies - 2 average
Innocent Blood
9 copies - 1.8 average
Blue Elemental Blast
9 copies - 1.8 average
Mana Leak
8 copies - 1.6 average
Powder Keg
8 copies - 1.6 average
Annul
8 copies - 1.6 average
Shadowmage Infiltrator
8 copies - 1.6 average
Tormod's Crypt
8 copies - 1.6 average