Most played cards in GW Depths:

1 Decks
Knight of the Reliquary
4 copies - 4 average
Green Sun's Zenith
4 copies - 4 average
Swords to Plowshares
4 copies - 4 average
Elvish Reclaimer
4 copies - 4 average
Crop Rotation
4 copies - 4 average
Windswept Heath
4 copies - 4 average
Wasteland
3 copies - 3 average
Mox Diamond
3 copies - 3 average
Pyroblast
3 copies - 3 average
Deafening Silence
3 copies - 3 average
Sylvan Library
3 copies - 3 average
Thespian's Stage
3 copies - 3 average
Endurance
3 copies - 3 average
Dark Depths
3 copies - 3 average
Choke
2 copies - 2 average
Flagstones of Trokair
2 copies - 2 average
Prismatic Ending
2 copies - 2 average
Force of Vigor
2 copies - 2 average
Yavimaya, Cradle of Growth
2 copies - 2 average
Savannah
2 copies - 2 average