Most played cards in UWR:

3 Decks
Counterspell
12 copies – 4 avg
Disenchant
12 copies – 4 avg
Tundra
12 copies – 4 avg
Swords to Plowshares
12 copies – 4 avg
Psionic Blast
11 copies – 3.67 avg
Lightning Bolt
11 copies – 3.67 avg
Serendib Efreet
11 copies – 3.67 avg
Volcanic Island
11 copies – 3.67 avg
Red Elemental Blast
9 copies – 3 avg
Mishra's Factory
7 copies – 2.33 avg
Chain Lightning
7 copies – 2.33 avg
Black Vise
7 copies – 2.33 avg
Serra Angel
6 copies – 2 avg
Blue Elemental Blast
6 copies – 2 avg
Plateau
6 copies – 2 avg
City of Brass
6 copies – 2 avg
Savannah Lions
4 copies – 1.33 avg
Fireball
3 copies – 1 avg
Divine Offering
3 copies – 1 avg
Control Magic
3 copies – 1 avg