Most played cards in Golgari:

2 Decks
Blooming Marsh
8 copies - 4 average
Winding Constrictor
8 copies - 4 average
Hissing Quagmire
8 copies - 4 average
Walking Ballista
8 copies - 4 average
Fatal Push
8 copies - 4 average
Transgress the Mind
7 copies - 3.5 average
Dissenter's Deliverance
6 copies - 3 average
Nissa, Voice of Zendikar
5 copies - 2.5 average
Never // Return
5 copies - 2.5 average
Grasp of Darkness
4 copies - 2 average
Aether Hub
4 copies - 2 average
Attune with Aether
4 copies - 2 average
Longtusk Cub
4 copies - 2 average
Greenbelt Rampager
4 copies - 2 average
Glint-Sleeve Siphoner
4 copies - 2 average
Dispossess
4 copies - 2 average
Traverse the Ulvenwald
4 copies - 2 average
Tireless Tracker
4 copies - 2 average
Grim Flayer
4 copies - 2 average
Verdurous Gearhulk
4 copies - 2 average