Most played cards in Mono White:

1 Decks
Legion Angel
4 copies - 4 average
Mazemind Tome
4 copies - 4 average
The Birth of Meletis
4 copies - 4 average
Ugin, the Spirit Dragon
4 copies - 4 average
Response // Resurgence
4 copies - 4 average
Elspeth Conquers Death
4 copies - 4 average
Skyclave Apparition
4 copies - 4 average
Shatter the Sky
4 copies - 4 average
Solemn Simulacrum
4 copies - 4 average
Ondu Inversion
4 copies - 4 average
Emeria's Call
4 copies - 4 average
Heliod's Intervention
3 copies - 3 average
Soul-Guide Lantern
2 copies - 2 average
Baneslayer Angel
2 copies - 2 average
Skyclave Relic
2 copies - 2 average
Giant Killer
2 copies - 2 average