Most played cards in Initiative WR:

3 Decks
Ancient Tomb
12 copies - 4 average
City of Traitors
12 copies - 4 average
Lotus Petal
12 copies - 4 average
Seasoned Dungeoneer
12 copies - 4 average
White Plume Adventurer
12 copies - 4 average
Chrome Mox
12 copies - 4 average
Caves of Chaos Adventurer
11 copies - 3.67 average
Fable of the Mirror-Breaker
11 copies - 3.67 average
Swords to Plowshares
11 copies - 3.67 average
Cavern of Souls
9 copies - 3 average
Archon of Emeria
9 copies - 3 average
Chancellor of the Annex
8 copies - 2.67 average
Containment Priest
7 copies - 2.33 average
Simian Spirit Guide
7 copies - 2.33 average
Touch the Spirit Realm
6 copies - 2 average
Pyroblast
6 copies - 2 average
Plateau
6 copies - 2 average
Solitude
6 copies - 2 average
Elite Spellbinder
6 copies - 2 average
Chalice of the Void
4 copies - 1.33 average