Most played cards in 5c Control:

6 Decks
Force of Will
24 copies - 4 average
Misty Rainforest
24 copies - 4 average
Brainstorm
24 copies - 4 average
Swords to Plowshares
24 copies - 4 average
Flooded Strand
21 copies - 3.5 average
Ponder
20 copies - 3.33 average
Uro, Titan of Nature's Wrath
18 copies - 3 average
Leyline Binding
16 copies - 2.67 average
Up the Beanstalk
16 copies - 2.67 average
Orcish Bowmasters
16 copies - 2.67 average
Force of Negation
15 copies - 2.5 average
Carpet of Flowers
13 copies - 2.17 average
Terminus
10 copies - 1.67 average
Endurance
10 copies - 1.67 average
Tundra
10 copies - 1.67 average
Wasteland
9 copies - 1.5 average
Hydroblast
9 copies - 1.5 average
Surgical Extraction
9 copies - 1.5 average
Tropical Island
9 copies - 1.5 average
Dress Down
8 copies - 1.33 average