Mono-Green Devotion
A Pioneer deck, by TacoFarmer
1st place at a tournament in Magic Online on 2019-11-03

Maindeck:
15 Forest

Artifact Creatures
4 Walking Ballista (Banned in Pioneer)

Creatures
4 Burning-Tree Emissary
4 Elvish Mystic
2 Jadelight Ranger
4 Llanowar Elves
4 Voracious Hydra

Enchantments
4 Leyline of Abundance (Banned in Pioneer)

Instants
4 Once Upon a Time (Banned in Pioneer)

Legendary Enchantments
4 Oath of Nissa

Legendary Planeswalkers
4 Nissa, Who Shakes the World
2 Vivien, Arkbow Ranger

Lands
1 Castle Garenbrig

Legendary Lands
4 Nykthos, Shrine to Nyx

Sideboard:
1 Hornet Queen
4 Nylea's Disciple
1 Reclamation Sage
3 Scavenging Ooze
2 Whisperwood Elemental
3 Shapers' Sanctuary
1 Ulamog, the Ceaseless Hunger