Most played cards in RUG :

2 Decks
Counterspell
4 copies - 2 average
Lightning Bolt
4 copies - 2 average
Serendib Efreet
4 copies - 2 average
Chain Lightning
3 copies - 1.5 average
Tropical Island
3 copies - 1.5 average
Volcanic Island
3 copies - 1.5 average
Stone Rain
3 copies - 1.5 average
Taiga
3 copies - 1.5 average
Red Elemental Blast
3 copies - 1.5 average
Blue Elemental Blast
3 copies - 1.5 average
Su-Chi
3 copies - 1.5 average
Psionic Blast
3 copies - 1.5 average
Ice Storm
3 copies - 1.5 average
City of Brass
3 copies - 1.5 average
Energy Flux
2 copies - 1 average
Shatter
2 copies - 1 average
Tetravus
2 copies - 1 average
Blood Moon
2 copies - 1 average
Control Magic
2 copies - 1 average
Sylvan Library
2 copies - 1 average