Most played cards in BW Control:

4 Decks
Swords to Plowshares
16 copies - 4 average
Scrubland
16 copies - 4 average
Disenchant
16 copies - 4 average
City of Brass
14 copies - 3.5 average
Circle of Protection: Red
12 copies - 3 average
Order of Leitbur
12 copies - 3 average
White Knight
12 copies - 3 average
Sinkhole
11 copies - 2.75 average
Hymn to Tourach
10 copies - 2.5 average
Divine Offering
9 copies - 2.25 average
The Abyss
8 copies - 2 average
Su-Chi
8 copies - 2 average
City in a Bottle
6 copies - 1.5 average
Ivory Tower
6 copies - 1.5 average
Serra Angel
6 copies - 1.5 average
Underworld Dreams
4 copies - 1 average
Demonic Tutor
4 copies - 1 average
Hypnotic Specter
4 copies - 1 average
Dark Ritual
4 copies - 1 average
Fellwar Stone
4 copies - 1 average