Affinity
A Modern deck, by Casey Welch
1st place at a tournament in Columbus, Ohio, United States on 2018-01-07

Maindeck:

Artifacts
4 Cranial Plating
4 Springleaf Drum

Artifact Creatures
4 Arcbound Ravager
3 Etched Champion
2 Master of Etherium
2 Memnite
4 Ornithopter
4 Signal Pest
4 Steel Overseer
4 Vault Skirge

Instants
4 Galvanic Blast

Legendary Artifacts
4 Mox Opal (Banned in Modern)

Artifact Lands
4 Darksteel Citadel

Basic Lands
1 Mountain

Lands
4 Blinkmoth Nexus
4 Inkmoth Nexus
4 Spire of Industry

Sideboard:
1 Engineered Explosives
1 Blood Moon
2 Ghirapur Aether Grid
2 Rest in Peace
2 Ancient Grudge
1 Surgical Extraction
1 Wear
3 Thoughtseize
1 Whipflare
1 Bitterblossom