23 Lands 
5 Island
2 Sunken Hollow
2 Smoldering Marsh
5 Mountain
2 Drowned Catacomb
2 Dragonskull Summit
2 Sulfur Falls
3 Aether Hub
15 Creatures 
2 Walking Ballista
2 Bomat Courier
2 Scrapheap Scrounger
2 Syndicate Trafficker
2 Scrap Trawler
3 Bastion Inventor
1 Torrential Gearhulk
1 Herald of Anguish
8 Artifacts 
1 Heart of Kiran
2 Key to the City
3 Servo Schematic
2 Smuggler's Copter
3 Enchantments 
3 Tezzeret's Touch
11 Instants 
2 Fatal Push
3 Fiery Temper
3 Metallic Rebuke
3 Unlicensed Disintegration
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About the Creator[]
Socur is a Magic: The Gathering player and youtuber, who regularly publishes videos about Deck Techs and Gameplay focusing on Magic Duels.
Visit his youtube channel here.
About the Deckbuild[]
Impromptu Machinery is a 
(Grixis) midrange deck featuring the Improvise ability from Aether Revolt.
Use Improvise to play out your big creatures early. Turn cheap artifacts or tokens into dangerous threats with Tezzeret's Touch and make them unblockable with Key to the City while dealing direct damage with a Madness Fiery Temper. Many, many combos and synergies are possible.
To see this deck in action and detailed deck tech (commentary in german) watch this video.