Most played cards in Control:

2 Decks
Fellwar Stone
8 copies - 4 average
Tundra
8 copies - 4 average
Swords to Plowshares
8 copies - 4 average
Disenchant
8 copies - 4 average
City of Brass
8 copies - 4 average
Counterspell
8 copies - 4 average
Mishra's Factory
8 copies - 4 average
Blue Elemental Blast
6 copies - 3 average
Jayemdae Tome
6 copies - 3 average
Red Elemental Blast
6 copies - 3 average
Volcanic Island
6 copies - 3 average
Serra Angel
4 copies - 2 average
Divine Offering
4 copies - 2 average
Fireball
4 copies - 2 average
The Abyss
4 copies - 2 average
Timetwister
2 copies - 1 average
Ancestral Recall
2 copies - 1 average
Regrowth
2 copies - 1 average
Recall
2 copies - 1 average
Disrupting Scepter
2 copies - 1 average