3 Board the Weatherlight
4 Bomat Courier
1 Chief of the Foundry
2 Foundry Inspector
1 Hangarback Walker
2 Karn, Scion of Urza
4 Metallic Mimic
3 Scrap Trawler
2 Scrapheap Scrounger
4 Sparring Construct
4 Steel Overseer
3 Teshar, Ancestor's Apostle
4 Walking Ballista
2 Yahenni, Undying Partisan
Sideboard:
2 Battle at the Bridge
3 Cartel Aristocrat
1 Chief Engineer
1 Door of Destinies
1 Hardened Scales
1 Inventors' Fair
1 Karn's Bastion
1 Metallic Rebuke
1 Nantuko Husk
1 Obelisk of Urd
1 Ravenous Intruder
1 Sai, Master Thopterist
1 Spire of Industry
2 Stoneforge Masterwork
1 Vanquisher's Banner
1 Whir of Invention
1 Zhalfirin Void