Hardened Scales
A Pioneer deck, by David Vaughn
5th place at a tournament in Louisville, Kentucky, United States on 2020-01-11
As reported at http://www.starcitygames.com

Maindeck:

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

Creatures
4 Experiment One
4 Pelt Collector
2 Voracious Hydra
4 Winding Constrictor

Enchantments
4 Hardened Scales

Legendary Creatures
2 Rishkar, Peema Renegade

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

Basic Lands
5 Forest

Lands
4 Blooming Marsh
4 Llanowar Wastes
4 Overgrown Tomb
4 Woodland Cemetery

Legendary Lands
1 Inventors' Fair

Sideboard:
2 Scavenging Ooze
3 Blossoming Defense
3 Fatal Push
2 Noxious Grasp
2 Pulse of Murasa
3 Thoughtseize