Most played cards in B/W Aggro:

3 Decks
Windbrisk Heights
12 copies - 4 average
Tidehollow Sculler
12 copies - 4 average
Arcane Sanctum
12 copies - 4 average
Kitchen Finks
12 copies - 4 average
Spectral Procession
12 copies - 4 average
Fetid Heath
11 copies - 3.67 average
Zealous Persecution
11 copies - 3.67 average
Path to Exile
10 copies - 3.33 average
Ajani Goldmane
10 copies - 3.33 average
Murderous Redcap
10 copies - 3.33 average
Burrenton Forge-Tender
10 copies - 3.33 average
Reflecting Pool
10 copies - 3.33 average
Bitterblossom
8 copies - 2.67 average
Knight of Meadowgrain
8 copies - 2.67 average
Cloudgoat Ranger
8 copies - 2.67 average
Infest
7 copies - 2.33 average
Mutavault
6 copies - 2 average
5 copies - 1.67 average
Identity Crisis
5 copies - 1.67 average
Duress
4 copies - 1.33 average