Most played cards in Karn Echo:

1 Decks
Echo of Eons
4 copies - 4 average
Day's Undoing
4 copies - 4 average
Ancient Tomb
4 copies - 4 average
Lion's Eye Diamond
4 copies - 4 average
Sea Gate Restoration
4 copies - 4 average
Lotus Petal
4 copies - 4 average
Chalice of the Void
4 copies - 4 average
Force of Will
4 copies - 4 average
Urza's Saga
4 copies - 4 average
Hullbreacher
4 copies - 4 average
Saprazzan Skerry
4 copies - 4 average
Narset, Parter of Veils
4 copies - 4 average
Karn, the Great Creator
3 copies - 3 average
Otawara, Soaring City
3 copies - 3 average
Force of Negation
3 copies - 3 average
Defense Grid
3 copies - 3 average
Chrome Mox
3 copies - 3 average
Tormod's Crypt
2 copies - 2 average
Ensnaring Bridge
1 copies - 1 average
Skysovereign, Consul Flagship
1 copies - 1 average