Most played cards in BW Control:

2 Decks
Swords to Plowshares
8 copies - 4 average
Scrubland
8 copies - 4 average
Disenchant
8 copies - 4 average
City of Brass
6 copies - 3 average
Ivory Tower
6 copies - 3 average
Serra Angel
6 copies - 3 average
Divine Offering
5 copies - 2.5 average
Circle of Protection: Red
5 copies - 2.5 average
Dark Ritual
4 copies - 2 average
Underworld Dreams
4 copies - 2 average
Hypnotic Specter
4 copies - 2 average
City in a Bottle
4 copies - 2 average
Greed
4 copies - 2 average
Ashnod's Transmogrant
4 copies - 2 average
Savannah Lions
4 copies - 2 average
White Knight
4 copies - 2 average
Fellwar Stone
4 copies - 2 average
Order of Leitbur
4 copies - 2 average
Clay Statue
4 copies - 2 average
Sinkhole
3 copies - 1.5 average