Most played cards in Millstone Control:

1 Decks
Disenchant
4 copies - 4 average
Tundra
4 copies - 4 average
Swords to Plowshares
4 copies - 4 average
Dust to Dust
4 copies - 4 average
Counterspell
4 copies - 4 average
Blue Elemental Blast
4 copies - 4 average
Mishra's Factory
3 copies - 3 average
Millstone
3 copies - 3 average
The Abyss
3 copies - 3 average
Mirror Universe
2 copies - 2 average
City of Brass
2 copies - 2 average
Underground Sea
2 copies - 2 average
Argivian Archaeologist
2 copies - 2 average
Jayemdae Tome
2 copies - 2 average
Tropical Island
2 copies - 2 average
Copy Artifact
2 copies - 2 average
Sylvan Library
2 copies - 2 average
Mind Twist
1 copies - 1 average
Disrupting Scepter
1 copies - 1 average
Demonic Tutor
1 copies - 1 average