Most played cards in Esper:

5 Decks
Disenchant
19 copies - 3.8 average
Swords to Plowshares
19 copies - 3.8 average
Serendib Efreet
17 copies - 3.4 average
Underground Sea
16 copies - 3.2 average
Tundra
16 copies - 3.2 average
City of Brass
14 copies - 2.8 average
Blue Elemental Blast
13 copies - 2.6 average
Counterspell
9 copies - 1.8 average
Mishra's Factory
9 copies - 1.8 average
Serra Angel
8 copies - 1.6 average
Circle of Protection: Red
8 copies - 1.6 average
Control Magic
6 copies - 1.2 average
Scrubland
6 copies - 1.2 average
Divine Offering
6 copies - 1.2 average
Moat
6 copies - 1.2 average
Sinkhole
5 copies - 1 average
Nevinyrral's Disk
5 copies - 1 average
Sol Ring
5 copies - 1 average
Time Walk
5 copies - 1 average
Animate Dead
5 copies - 1 average