Most played cards in Mono Green:

2 Decks
Elvish Mystic
8 copies - 4 average
Wooded Foothills
7 copies - 3.5 average
Servant of the Scale
4 copies - 2 average
Hangarback Walker
4 copies - 2 average
Weirding Wood
4 copies - 2 average
Dromoka's Command
4 copies - 2 average
Jaddi Offshoot
4 copies - 2 average
Hardened Scales
4 copies - 2 average
Reclamation Sage
4 copies - 2 average
Oath of Nissa
4 copies - 2 average
Nissa, Voice of Zendikar
4 copies - 2 average
Nissa's Pilgrimage
4 copies - 2 average
Avatar of the Resolute
4 copies - 2 average
Shrine of the Forsaken Gods
4 copies - 2 average
Sanctum of Ugin
4 copies - 2 average
Windswept Heath
4 copies - 2 average
Rattleclaw Mystic
4 copies - 2 average
World Breaker
4 copies - 2 average
Managorger Hydra
4 copies - 2 average
Explosive Vegetation
4 copies - 2 average