Most played cards in Omnath, Locus of Mana:

2 Decks
Scavenging Ooze
2 copies - 1 average
Wood Elves
2 copies - 1 average
Beast Within
2 copies - 1 average
Sakura-Tribe Elder
2 copies - 1 average
Reclamation Sage
2 copies - 1 average
Priest of Titania
2 copies - 1 average
Primeval Titan
2 copies - 1 average
Chord of Calling
2 copies - 1 average
Rofellos, Llanowar Emissary
2 copies - 1 average
Green Sun's Zenith
2 copies - 1 average
Sylvan Library
2 copies - 1 average
Utopia Sprawl
2 copies - 1 average
Wild Growth
2 copies - 1 average
Survival of the Fittest
2 copies - 1 average
Garruk Wildspeaker
2 copies - 1 average
Kodama's Reach
2 copies - 1 average
Tooth and Nail
2 copies - 1 average
Oracle of Mul Daya
2 copies - 1 average
Surrak, the Hunt Caller
2 copies - 1 average
Boreal Druid
2 copies - 1 average