Most played cards in 4c Control:

4 Decks
Force of Will
16 copies - 4 average
Pyroblast
13 copies - 3.25 average
Force of Vigor
12 copies - 3 average
Deathrite Shaman
12 copies - 3 average
Wasteland
12 copies - 3 average
Wrenn and Six
10 copies - 2.5 average
Wooded Foothills
10 copies - 2.5 average
Collector Ouphe
10 copies - 2.5 average
Ragavan, Nimble Pilferer
10 copies - 2.5 average
Endurance
10 copies - 2.5 average
Flusterstorm
9 copies - 2.25 average
Tropical Island
8 copies - 2 average
Volcanic Island
7 copies - 1.75 average
Surgical Extraction
7 copies - 1.75 average
Oko, Thief of Crowns
6 copies - 1.5 average
Scalding Tarn
6 copies - 1.5 average
The Tabernacle at Pendrell Vale
6 copies - 1.5 average
Polluted Delta
6 copies - 1.5 average
Gitaxian Probe
4 copies - 1 average
Strip Mine
4 copies - 1 average