Most played cards in BRUG Cascade:

3 Decks
Deathrite Shaman
12 copies - 4 average
Brainstorm
12 copies - 4 average
Baleful Strix
12 copies - 4 average
Shardless Agent
11 copies - 3.67 average
Thoughtseize
10 copies - 3.33 average
Tarmogoyf
10 copies - 3.33 average
Force of Will
10 copies - 3.33 average
Misty Rainforest
9 copies - 3 average
Grove of the Burnwillows
9 copies - 3 average
Punishing Fire
9 copies - 3 average
Wasteland
8 copies - 2.67 average
Surgical Extraction
6 copies - 2 average
Polluted Delta
6 copies - 2 average
Jace, the Mind Sculptor
6 copies - 2 average
Underground Sea
6 copies - 2 average
Flusterstorm
6 copies - 2 average
Tropical Island
6 copies - 2 average
Daze
6 copies - 2 average
Noble Hierarch
4 copies - 1.33 average
Leovold, Emissary of Trest
4 copies - 1.33 average