Mono-Green Devotion
A Pioneer deck, by LuisMJ
1st place at a tournament in Magic Online on 2020-07-26

Maindeck:

Artifact Creatures
3 Walking Ballista (Banned in Pioneer)

Creatures
4 Burning-Tree Emissary
4 Elvish Mystic
4 Jadelight Ranger
4 Llanowar Elves
3 Voracious Hydra
1 Voyaging Satyr

Legendary Enchantments
4 Oath of Nissa

Legendary Planeswalkers
4 Karn, the Great Creator
4 Nissa, Who Shakes the World
4 Vivien, Arkbow Ranger

Basic Lands
15 Forest

Lands
2 Castle Garenbrig

Legendary Lands
4 Nykthos, Shrine to Nyx

Sideboard:
1 Damping Sphere
1 Grafdigger's Cage
1 Pithing Needle
1 Tormod's Crypt
1 Meteor Golem
1 Verdurous Gearhulk
1 Walking Ballista (Banned in Pioneer)
1 Scavenging Ooze
1 Voracious Hydra
1 God-Pharaoh's Statue
1 Skysovereign, Consul Flagship
1 The Great Henge
1 Emrakul, the Promised End
1 Ulamog, the Ceaseless Hunger
1 Darksteel Citadel