Most played cards in R/W Control:

2 Decks
Snow-Covered Plains
13 copies - 6.5 average
Wrath of God
8 copies - 4 average
Oblivion Ring
8 copies - 4 average
Story Circle
7 copies - 3.5 average
Molten Disaster
7 copies - 3.5 average
Coalition Relic
6 copies - 3 average
Pyroclasm
6 copies - 3 average
Extirpate
4 copies - 2 average
Coldsteel Heart
4 copies - 2 average
Scrying Sheets
4 copies - 2 average
Martyr of Sands
4 copies - 2 average
Quagnoth
4 copies - 2 average
Stuffy Doll
4 copies - 2 average
Snow-Covered Mountain
4 copies - 2 average
Skred
4 copies - 2 average
Mana Tithe
4 copies - 2 average
Vivid Meadow
4 copies - 2 average
Epochrasite
4 copies - 2 average
Horizon Canopy
4 copies - 2 average
Condemn
4 copies - 2 average