Hardened Scales
A Pioneer deck, by Tayen Owens
4th place at a tournament in Findlay, Ohio, United States on 2020-01-11
As reported at http://www.starcitygames.com

Maindeck:
5 Forest

Artifact Creatures
3 Hangarback Walker
4 Stonecoil Serpent
4 Walking Ballista (Banned in Pioneer)

Creatures
2 Elvish Mystic
4 Llanowar Elves
4 Voracious Hydra
4 Winding Constrictor

Enchantments
4 Hardened Scales

Instants
2 Abrupt Decay

Legendary Creatures
1 Rishkar, Peema Renegade

Legendary Planeswalkers
4 Nissa, Voice of Zendikar
2 Vivien, Arkbow Ranger

Lands
3 Blooming Marsh
1 Castle Garenbrig
1 Karn's Bastion
4 Llanowar Wastes
4 Overgrown Tomb
4 Woodland Cemetery

Sideboard:
2 Mistcutter Hydra
2 Scavenging Ooze
1 Evolutionary Leap
3 Fatal Push
2 Noxious Grasp
1 Languish
4 Thoughtseize