Grinding Breach
A Modern deck, by Jeff Pyka
3rd place at a tournament in Newington, Connecticut, United States on 2020-03-01
As reported at http://www.starcitygames.com

Maindeck:

Artifacts
3 Engineered Explosives
2 Everflowing Chalice
4 Grinding Station
4 Mishra's Bauble

Creatures
1 Thassa's Oracle

Enchantments
4 Underworld Breach

Instants
2 Cryptic Command
2 Galvanic Blast
3 Metallic Rebuke
1 Muddle the Mixture

Legendary Artifacts
2 Mox Amber

Legendary Creatures
4 Emry, Lurker of the Loch

Legendary Planeswalkers
3 Teferi, Time Raveler

Snow Artifacts
4 Arcum's Astrolabe (Banned in Modern)

Sorceries
1 Dance of the Manse

Basic Snow Lands
4 Snow-Covered Island
1 Snow-Covered Mountain
1 Snow-Covered Plains

Lands
4 Flooded Strand
1 Hallowed Fountain
2 Mystic Sanctuary (Banned in Modern)
4 Scalding Tarn
2 Steam Vents

Legendary Lands
1 Hall of Heliod's Generosity

Sideboard:
2 Tormod's Crypt
2 Blood Moon
2 Aether Gust
1 Ceremonious Rejection
1 Mystical Dispute
1 Swan Song
2 Hope of Ghirapur
2 Sai, Master Thopterist
2 Timely Reinforcements