Most played cards in Hardened Scales:

1 Decks
Hangarback Walker
4 copies - 4 average
Steel Overseer
4 copies - 4 average
Mox Opal
4 copies - 4 average
Ancient Stirrings
4 copies - 4 average
Nature's Claim
4 copies - 4 average
Hardened Scales
4 copies - 4 average
Arcbound Ravager
4 copies - 4 average
Walking Ballista
4 copies - 4 average
Inkmoth Nexus
4 copies - 4 average
Arcbound Worker
4 copies - 4 average
Darksteel Citadel
4 copies - 4 average
Damping Sphere
3 copies - 3 average
Welding Jar
3 copies - 3 average
Buried Ruin
2 copies - 2 average
Dismember
2 copies - 2 average
Grafdigger's Cage
2 copies - 2 average
Horizon Canopy
2 copies - 2 average
Throne of Geth
2 copies - 2 average
Tormod's Crypt
2 copies - 2 average
Animation Module
2 copies - 2 average