Most played cards in B/R Control:

1 Decks
Smoldering Marsh
4 copies - 4 average
Transgress the Mind
4 copies - 4 average
Foreboding Ruins
4 copies - 4 average
Goblin Dark-Dwellers
3 copies - 3 average
Languish
3 copies - 3 average
Orbs of Warding
3 copies - 3 average
Ruinous Path
3 copies - 3 average
Read the Bones
3 copies - 3 average
Duress
3 copies - 3 average
Fiery Impulse
3 copies - 3 average
Kalitas, Traitor of Ghet
3 copies - 3 average
Rending Volley
2 copies - 2 average
Infinite Obliteration
2 copies - 2 average
Necromantic Summons
2 copies - 2 average
Liliana, the Last Hope
2 copies - 2 average
Chandra, Flamecaller
2 copies - 2 average
Kolaghan's Command
2 copies - 2 average
Grasp of Darkness
2 copies - 2 average
Ultimate Price
2 copies - 2 average
Ob Nixilis Reignited
2 copies - 2 average