Most played cards in Survival:

1 Decks
Mental Misstep
4 copies - 4 average
Bazaar of Baghdad
4 copies - 4 average
Force of Vigor
4 copies - 4 average
Basking Rootwalla
4 copies - 4 average
Survival of the Fittest
4 copies - 4 average
Vengevine
4 copies - 4 average
Deathrite Shaman
4 copies - 4 average
Ravenous Trap
4 copies - 4 average
Hollow One
4 copies - 4 average
Tropical Island
3 copies - 3 average
Collector Ouphe
3 copies - 3 average
Yixlid Jailer
3 copies - 3 average
Energy Flux
2 copies - 2 average
Verdant Catacombs
2 copies - 2 average
Assassin's Trophy
2 copies - 2 average
Windswept Heath
2 copies - 2 average
Elvish Spirit Guide
2 copies - 2 average
Bazaar Trademage
2 copies - 2 average
Leovold, Emissary of Trest
2 copies - 2 average
Misty Rainforest
2 copies - 2 average