Affinity
A Modern deck, by Alex Majlaton
4th place at a tournament in Toronto, Canada on 2012-12-09
As reported at http://www.wizards.com/Magic/Magazine/Article.aspx?x=mtg/daily/eventcoverage/gptor12/welcome#dl

Maindeck:

Artifacts
4 Cranial Plating
4 Springleaf Drum
1 Welding Jar

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

Legendary Artifacts
4 Mox Opal (Banned in Modern)

Sorceries
4 Thoughtcast
2 Whipflare

Artifact Lands
4 Darksteel Citadel

Basic Lands
1 Island

Lands
4 Blinkmoth Nexus
3 Glimmervoid
4 Inkmoth Nexus

Sideboard:
3 Etched Champion
2 Ethersworn Canonist
2 Rest in Peace
1 Ancient Grudge
2 Dismember
1 Ray of Revelation
2 Spell Pierce
2 Thoughtseize