Grinding Breach
A Modern deck, by Hal Brady
8th place at a tournament in Dallas, Texas, United States on 2020-03-07
As reported at http://www.starcitygames.com

Maindeck:

Artifacts
3 Chromatic Star
4 Engineered Explosives
4 Grinding Station
4 Mishra's Bauble

Creatures
1 Thassa's Oracle

Enchantments
4 Underworld Breach

Instants
1 Galvanic Blast
2 Metallic Rebuke

Legendary Artifacts
2 Mox Amber

Legendary Creatures
4 Emry, Lurker of the Loch
2 Sai, Master Thopterist

Legendary Planeswalkers
3 Teferi, Time Raveler

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

Sorceries
2 Serum Visions

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

Lands
4 Flooded Strand
1 Hallowed Fountain
2 Polluted Delta
4 Scalding Tarn
2 Steam Vents

Legendary Lands
1 Hall of Heliod's Generosity

Sideboard:
3 Tormod's Crypt
2 Aether Gust
2 Ceremonious Rejection
1 Echoing Truth
1 Galvanic Blast
1 Lightning Bolt
3 Mystical Dispute
2 Wear