Most played cards in R/G Control:

2 Decks
Kitchen Finks
8 copies - 4 average
Mosswort Bridge
8 copies - 4 average
Lignify
8 copies - 4 average
Woodfall Primus
8 copies - 4 average
Fire-Lit Thicket
8 copies - 4 average
Firespout
8 copies - 4 average
Devoted Druid
8 copies - 4 average
Cloudthresher
8 copies - 4 average
Dramatic Entrance
8 copies - 4 average
Primal Command
7 copies - 3.5 average
Oversoul of Dusk
6 copies - 3 average
Garruk Wildspeaker
4 copies - 2 average
Faerie Macabre
4 copies - 2 average
Mutavault
4 copies - 2 average
Chameleon Colossus
4 copies - 2 average
Fertile Ground
4 copies - 2 average
Vexing Shusher
3 copies - 1.5 average
Grim Poppet
3 copies - 1.5 average
Incendiary Command
3 copies - 1.5 average
Mercy Killing
3 copies - 1.5 average