Most played cards in Gush Storm:

4 Decks
Force of Will
16 copies - 4 average
Gush
14 copies - 3.5 average
Young Pyromancer
14 copies - 3.5 average
Polluted Delta
14 copies - 3.5 average
Gitaxian Probe
13 copies - 3.25 average
Mental Misstep
13 copies - 3.25 average
Cabal Therapy
13 copies - 3.25 average
Volcanic Island
11 copies - 2.75 average
Underground Sea
10 copies - 2.5 average
Preordain
10 copies - 2.5 average
Ingot Chewer
9 copies - 2.25 average
Scalding Tarn
8 copies - 2 average
Dack Fayden
8 copies - 2 average
Leyline of the Void
7 copies - 1.75 average
Pyroblast
6 copies - 1.5 average
Null Rod
6 copies - 1.5 average
Ancient Grudge
6 copies - 1.5 average
Fatal Push
6 copies - 1.5 average
Ravenous Trap
6 copies - 1.5 average
Snapcaster Mage
5 copies - 1.25 average