Most played cards in CopyCat:

1 Decks
Arid Mesa
4 copies - 4 average
Glasspool Mimic
4 copies - 4 average
Felidar Guardian
4 copies - 4 average
Wall of Omens
4 copies - 4 average
Watcher for Tomorrow
4 copies - 4 average
Aether Vial
4 copies - 4 average
Ephemerate
4 copies - 4 average
Snow-Covered Plains
4 copies - 4 average
Skyclave Apparition
4 copies - 4 average
Flooded Strand
4 copies - 4 average
Soulherder
3 copies - 3 average
Force of Negation
3 copies - 3 average
On Thin Ice
3 copies - 3 average
Saheeli Rai
3 copies - 3 average
Auriok Champion
3 copies - 3 average
Damping Sphere
3 copies - 3 average
Avalanche Riders
2 copies - 2 average
Leonin Relic-Warder
2 copies - 2 average
Elite Spellbinder
2 copies - 2 average
Rest in Peace
2 copies - 2 average