Most played cards in Esper:

1 Decks
Harm's Way
4 copies - 4 average
Ethersworn Shieldmage
4 copies - 4 average
Path to Exile
4 copies - 4 average
Tidehollow Sculler
4 copies - 4 average
Ethersworn Canonist
4 copies - 4 average
Meddling Mage
4 copies - 4 average
Cryptic Command
4 copies - 4 average
Arcane Sanctum
4 copies - 4 average
Reveillark
3 copies - 3 average
Thistledown Liege
3 copies - 3 average
Terramorphic Expanse
3 copies - 3 average
Sleep
3 copies - 3 average
Zealous Persecution
3 copies - 3 average
Glacial Fortress
3 copies - 3 average
Esper Charm
3 copies - 3 average
Countersquall
2 copies - 2 average
Stillmoon Cavalier
2 copies - 2 average
Glen Elendra Archmage
2 copies - 2 average
Drowned Catacomb
2 copies - 2 average
Fetid Heath
2 copies - 2 average