Gruul Prison
A Modern deck, by Brett Smith
2nd place at a tournament in Durham, North Carolina, United States on 2020-01-04
As reported at http://www.starcitygames.com

Maindeck:

Creatures
4 Arbor Elf
4 Bloodbraid Elf
3 Goblin Rabblemaster
2 Hexdrinker
2 Magus of the Moon

Enchantments
4 Utopia Sprawl

Instants
4 Lightning Bolt
4 Once Upon a Time (Banned in Modern)

Legendary Planeswalkers
1 Chandra, Awakened Inferno
4 Karn, the Great Creator
3 Wrenn and Six

Sorceries
4 Pillage

Basic Lands
5 Forest
4 Mountain

Lands
1 Castle Embereth
1 Ghost Quarter
2 Stomping Ground
1 Waterlogged Grove
4 Windswept Heath
3 Wooded Foothills

Sideboard:
1 Ensnaring Bridge
1 Liquimetal Coating
1 Mycosynth Lattice (Banned in Modern)
1 Relic of Progenitus
1 Tormod's Crypt
1 Trinisphere
1 Walking Ballista
2 Collector Ouphe
1 Cindervines
2 Veil of Summer
2 Weather the Storm
1 Anger of the Gods