Most played cards in The Rock:

5 Decks
Loxodon Hierarch
19 copies - 3.8 average
Farseek
19 copies - 3.8 average
Mortify
19 copies - 3.8 average
Civic Wayfinder
19 copies - 3.8 average
Faith's Fetters
18 copies - 3.6 average
Putrefy
17 copies - 3.4 average
Vitu-Ghazi, the City-Tree
16 copies - 3.2 average
Angel of Despair
16 copies - 3.2 average
Temple Garden
15 copies - 3 average
Godless Shrine
15 copies - 3 average
Skeletal Vampire
14 copies - 2.8 average
Overgrown Tomb
12 copies - 2.4 average
Culling Sun
12 copies - 2.4 average
Congregation at Dawn
12 copies - 2.4 average
Cremate
10 copies - 2 average
10 copies - 2 average
Seed Spark
8 copies - 1.6 average
Absolver Thrull
7 copies - 1.4 average
Birds of Paradise
7 copies - 1.4 average
Rolling Spoil
7 copies - 1.4 average