Most played cards in Pebbles:

3 Decks
Academy Rector
12 copies - 4 average
Cabal Therapy
12 copies - 4 average
City of Brass
11 copies - 3.67 average
Goblin Bombardment
10 copies - 3.33 average
Shield Sphere
10 copies - 3.33 average
Enlightened Tutor
8 copies - 2.67 average
Gemstone Mine
8 copies - 2.67 average
Enduring Renewal
7 copies - 2.33 average
Defense Grid
5 copies - 1.67 average
Phyrexian Tower
5 copies - 1.67 average
Phyrexian Walker
5 copies - 1.67 average
Survival of the Fittest
4 copies - 1.33 average
Wall of Roots
4 copies - 1.33 average
Adarkar Wastes
4 copies - 1.33 average
Reflecting Pool
4 copies - 1.33 average
Pyroblast
4 copies - 1.33 average
Underground River
4 copies - 1.33 average
Impulse
4 copies - 1.33 average
Arcane Denial
4 copies - 1.33 average
Sulfurous Springs
4 copies - 1.33 average