Most played cards in Grixis Control:

1 Decks
Essence Scatter
4 copies - 4 average
Fetid Pools
4 copies - 4 average
Canyon Slough
4 copies - 4 average
Disallow
4 copies - 4 average
Aether Hub
4 copies - 4 average
Glint-Sleeve Siphoner
4 copies - 4 average
Vraska's Contempt
4 copies - 4 average
Torrential Gearhulk
3 copies - 3 average
Drowned Catacomb
3 copies - 3 average
Sulfur Falls
3 copies - 3 average
Negate
3 copies - 3 average
Nicol Bolas, the Ravager
3 copies - 3 average
Whirler Virtuoso
3 copies - 3 average
Chandra, Torch of Defiance
2 copies - 2 average
Chandra's Defeat
2 copies - 2 average
Glorybringer
2 copies - 2 average
Dragonskull Summit
2 copies - 2 average
Sweltering Suns
2 copies - 2 average
Cast Down
2 copies - 2 average
Abrade
2 copies - 2 average