Most played cards in 4c Control:

2 Decks
Force of Will
8 copies - 4 average
Wasteland
8 copies - 4 average
Deathrite Shaman
8 copies - 4 average
Leyline of the Void
8 copies - 4 average
Force of Vigor
7 copies - 3.5 average
Flusterstorm
7 copies - 3.5 average
Polluted Delta
6 copies - 3 average
Wrenn and Six
5 copies - 2.5 average
Tropical Island
5 copies - 2.5 average
Scalding Tarn
4 copies - 2 average
Expressive Iteration
4 copies - 2 average
Oko, Thief of Crowns
4 copies - 2 average
Force of Negation
4 copies - 2 average
Dismember
3 copies - 1.5 average
Volcanic Island
3 copies - 1.5 average
Collector Ouphe
3 copies - 1.5 average
Pyroblast
3 copies - 1.5 average
Boseiju, Who Endures
3 copies - 1.5 average
Shattering Spree
3 copies - 1.5 average
Assassin's Trophy
2 copies - 1 average