Most played cards in Grixis Control:

1 Decks
Ponder
4 copies - 4 average
Brainstorm
4 copies - 4 average
Polluted Delta
4 copies - 4 average
Scalding Tarn
4 copies - 4 average
Baleful Strix
4 copies - 4 average
Deathrite Shaman
4 copies - 4 average
Force of Will
4 copies - 4 average
Underground Sea
3 copies - 3 average
Misty Rainforest
2 copies - 2 average
Volcanic Island
2 copies - 2 average
Pithing Needle
2 copies - 2 average
Surgical Extraction
2 copies - 2 average
Flusterstorm
2 copies - 2 average
Pyroblast
2 copies - 2 average
Marsh Casualties
2 copies - 2 average
Diabolic Edict
2 copies - 2 average
Engineered Explosives
2 copies - 2 average
Kolaghan's Command
2 copies - 2 average
Counterspell
2 copies - 2 average
Gurmag Angler
2 copies - 2 average