Most played cards in URb Control:

2 Decks
Volcanic Island
8 copies - 4 average
Lightning Bolt
8 copies - 4 average
Shatter
6 copies - 3 average
Blood Moon
6 copies - 3 average
City of Brass
6 copies - 3 average
Counterspell
5 copies - 2.5 average
Strip Mine
5 copies - 2.5 average
Red Elemental Blast
5 copies - 2.5 average
Psychic Venom
4 copies - 2 average
Power Sink
4 copies - 2 average
Blue Elemental Blast
3 copies - 1.5 average
Badlands
3 copies - 1.5 average
Copy Artifact
3 copies - 1.5 average
Icy Manipulator
3 copies - 1.5 average
Phantasmal Terrain
3 copies - 1.5 average
Demonic Tutor
2 copies - 1 average
Mahamoti Djinn
2 copies - 1 average
Braingeyser
2 copies - 1 average
Sol Ring
2 copies - 1 average
Atog
2 copies - 1 average