Most played cards in Depths:

5 Decks
Elvish Reclaimer
19 copies - 3.8 average
Crop Rotation
17 copies - 3.4 average
Windswept Heath
16 copies - 3.2 average
Swords to Plowshares
16 copies - 3.2 average
Green Sun's Zenith
16 copies - 3.2 average
Thespian's Stage
15 copies - 3 average
Mox Diamond
15 copies - 3 average
Knight of the Reliquary
15 copies - 3 average
Endurance
14 copies - 2.8 average
Orcish Bowmasters
12 copies - 2.4 average
Force of Vigor
12 copies - 2.4 average
Wasteland
12 copies - 2.4 average
Dark Depths
12 copies - 2.4 average
Yavimaya, Cradle of Growth
9 copies - 1.8 average
Savannah
8 copies - 1.6 average
Thoughtseize
8 copies - 1.6 average
Veil of Summer
8 copies - 1.6 average
Flagstones of Trokair
7 copies - 1.4 average
Legolas's Quick Reflexes
7 copies - 1.4 average
Bayou
6 copies - 1.2 average