Most played cards in U/R Dragon Visions:

2 Decks
Fevered Visions
8 copies - 4 average
Eldrazi Skyspawner
8 copies - 4 average
Collective Defiance
8 copies - 4 average
Wandering Fumarole
8 copies - 4 average
Silumgar's Scorn
8 copies - 4 average
Draconic Roar
8 copies - 4 average
Shivan Reef
8 copies - 4 average
Highland Lake
8 copies - 4 average
Thunderbreak Regent
8 copies - 4 average
Icefall Regent
7 copies - 3.5 average
Incendiary Flow
7 copies - 3.5 average
Haven of the Spirit Dragon
7 copies - 3.5 average
Dragon Tempest
5 copies - 2.5 average
Stormchaser Mage
4 copies - 2 average
Dispel
4 copies - 2 average
Rending Volley
4 copies - 2 average
Dragonlord Silumgar
3 copies - 1.5 average
Grip of the Roil
3 copies - 1.5 average
Goblin Dark-Dwellers
3 copies - 1.5 average
Disperse
3 copies - 1.5 average