Most played cards in Dreams Combo:

2 Decks
Underground Sea
8 copies - 4 average
Dark Ritual
8 copies - 4 average
Badlands
8 copies - 4 average
Lightning Bolt
7 copies - 3.5 average
Underworld Dreams
7 copies - 3.5 average
City of Brass
6 copies - 3 average
Red Elemental Blast
6 copies - 3 average
Blue Elemental Blast
5 copies - 2.5 average
Gloom
5 copies - 2.5 average
Volcanic Island
4 copies - 2 average
Winds of Change
4 copies - 2 average
Sinkhole
4 copies - 2 average
Hypnotic Specter
4 copies - 2 average
Howling Mine
4 copies - 2 average
Black Vise
3 copies - 1.5 average
Serendib Efreet
3 copies - 1.5 average
Mishra's Factory
3 copies - 1.5 average
Boomerang
3 copies - 1.5 average
Flash Counter
3 copies - 1.5 average
Sylvan Library
2 copies - 1 average