Most played cards in Control:

5 Decks
Lórien Revealed
20 copies - 4 average
Flooded Strand
20 copies - 4 average
Brainstorm
20 copies - 4 average
Swords to Plowshares
20 copies - 4 average
Leyline Binding
20 copies - 4 average
Up the Beanstalk
20 copies - 4 average
Force of Will
20 copies - 4 average
Ponder
20 copies - 4 average
Misty Rainforest
19 copies - 3.8 average
Force of Negation
17 copies - 3.4 average
Uro, Titan of Nature's Wrath
12 copies - 2.4 average
Wasteland
12 copies - 2.4 average
Carpet of Flowers
11 copies - 2.2 average
Tundra
10 copies - 2 average
Hydroblast
9 copies - 1.8 average
Surgical Extraction
9 copies - 1.8 average
Tropical Island
8 copies - 1.6 average
Triumph of Saint Katherine
8 copies - 1.6 average
The One Ring
8 copies - 1.6 average
Mystic Sanctuary
8 copies - 1.6 average