Most played cards in Esper:

3 Decks
Tundra
12 copies - 4 average
Serendib Efreet
11 copies - 3.67 average
Disenchant
11 copies - 3.67 average
Swords to Plowshares
11 copies - 3.67 average
Underground Sea
10 copies - 3.33 average
Mishra's Factory
7 copies - 2.33 average
Blue Elemental Blast
7 copies - 2.33 average
City of Brass
6 copies - 2 average
Circle of Protection: Red
5 copies - 1.67 average
Counterspell
5 copies - 1.67 average
Su-Chi
4 copies - 1.33 average
Juggernaut
4 copies - 1.33 average
Moat
4 copies - 1.33 average
Dust to Dust
4 copies - 1.33 average
Divine Offering
4 copies - 1.33 average
Serra Angel
4 copies - 1.33 average
Control Magic
4 copies - 1.33 average
Order of Leitbur
4 copies - 1.33 average
Savannah Lions
4 copies - 1.33 average
Demonic Tutor
3 copies - 1 average