Grixis Whirza
A Modern deck, by William Rea
3rd place at a tournament in Cary, North Carolina, United States on 2020-02-16
As reported at http://www.starcitygames.com

Maindeck:

Artifacts
1 Aether Spellbomb
1 Chromatic Star
2 Engineered Explosives
1 Ensnaring Bridge
1 Ichor Wellspring
4 Mishra's Bauble
3 Pentad Prism
1 Pithing Needle
2 Sword of the Meek
4 Thopter Foundry

Creatures
3 Goblin Engineer

Instants
3 Galvanic Blast
2 Whir of Invention

Legendary Creatures
4 Emry, Lurker of the Loch
4 Urza, Lord High Artificer

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

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

Lands
1 Breeding Pool
2 Flooded Strand
2 Mystic Sanctuary (Banned in Modern)
4 Polluted Delta
3 Scalding Tarn
1 Steam Vents
1 Watery Grave

Sideboard:
1 Damping Sphere
1 Grafdigger's Cage
1 Nihil Spellbomb
2 Magus of the Moon
1 Blood Moon
1 Ghirapur Aether Grid
1 Assassin's Trophy
1 Drown in the Loch
2 Weather the Storm
2 Ashiok, Dream Render
1 Tezzeret, Agent of Bolas
1 Angrath's Rampage