Most played cards in Mono White:

1 Decks
Luminarch Aspirant
4 copies - 4 average
Thalia, Guardian of Thraben
4 copies - 4 average
Leonin Arbiter
4 copies - 4 average
Leyline of the Void
4 copies - 4 average
Cavern of Souls
4 copies - 4 average
Wasteland
4 copies - 4 average
Archon of Emeria
4 copies - 4 average
Cathar Commando
4 copies - 4 average
Deafening Silence
3 copies - 3 average
Path to Exile
3 copies - 3 average
Spirit of the Labyrinth
3 copies - 3 average
Hopeful Initiate
2 copies - 2 average
Ghost Quarter
2 copies - 2 average
Glowrider
2 copies - 2 average
Esper Sentinel
2 copies - 2 average
Containment Priest
2 copies - 2 average
Serenity
2 copies - 2 average
Stony Silence
2 copies - 2 average
Sanctifier En-Vec
2 copies - 2 average
Strip Mine
1 copies - 1 average