Most played cards in Esper:

1 Decks
Sunscape Familiar
4 copies - 4 average
Preordain
4 copies - 4 average
Ash Barrens
4 copies - 4 average
Snap
4 copies - 4 average
Sea Gate Oracle
4 copies - 4 average
Lone Missionary
4 copies - 4 average
Mulldrifter
4 copies - 4 average
Azorius Chancery
3 copies - 3 average
Prismatic Strands
3 copies - 3 average
Dimir Aqueduct
3 copies - 3 average
Hydroblast
3 copies - 3 average
Hoodwink
3 copies - 3 average
Ghostly Flicker
3 copies - 3 average
Compulsive Research
3 copies - 3 average
Nightscape Familiar
2 copies - 2 average
Circle of Protection: Blue
2 copies - 2 average
Mnemonic Wall
2 copies - 2 average
Man-o'-War
2 copies - 2 average
Spellstutter Sprite
2 copies - 2 average
Dinrova Horror
2 copies - 2 average