Most played cards in Dreams Combo:

4 Decks
Underground Sea
16 copies - 4 average
Badlands
16 copies - 4 average
Dark Ritual
16 copies - 4 average
Underworld Dreams
15 copies - 3.75 average
Lightning Bolt
15 copies - 3.75 average
City of Brass
14 copies - 3.5 average
Howling Mine
12 copies - 3 average
Red Elemental Blast
12 copies - 3 average
Winds of Change
12 copies - 3 average
Volcanic Island
8 copies - 2 average
Boomerang
8 copies - 2 average
Flash Counter
8 copies - 2 average
Blue Elemental Blast
8 copies - 2 average
Energy Flux
8 copies - 2 average
Gloom
5 copies - 1.25 average
City in a Bottle
5 copies - 1.25 average
Ivory Tower
5 copies - 1.25 average
Braingeyser
4 copies - 1 average
Timetwister
4 copies - 1 average
Wheel of Fortune
4 copies - 1 average