Most played cards in Quiet Storm:

3 Decks
Seething Song
12 copies - 4 average
Rite of Flame
12 copies - 4 average
Lotus Bloom
12 copies - 4 average
Wooded Foothills
12 copies - 4 average
Burning Wish
12 copies - 4 average
Bloodstained Mire
12 copies - 4 average
Pyromancer's Swath
11 copies - 3.67 average
Quiet Speculation
11 copies - 3.67 average
Tormod's Crypt
11 copies - 3.67 average
Steam Vents
11 copies - 3.67 average
Desperate Ritual
11 copies - 3.67 average
Grapeshot
11 copies - 3.67 average
Lava Dart
10 copies - 3.33 average
Empty the Warrens
9 copies - 3 average
8 copies - 2.67 average
Ponder
8 copies - 2.67 average
Chrome Mox
6 copies - 2 average
Deep Analysis
5 copies - 1.67 average
Leyline of the Void
4 copies - 1.33 average
Sulfur Vent
4 copies - 1.33 average