In Out Reason
Goblin Engineer Pia Nalaar Flexible tutor and recursion.
Kuldotha Forgemaster Steel Overseer
Repeatable tutor and sac outlet.
Scrapyard Recombiner Digsite Engineer
Flexible tutor, lots of amazing targets.
Myr Retriever Sanctum Gargoyle
Amazing recursion and sac fodder.
Goblin Welder Hellkite Igniter
Ridiculously efficient reanimation and sac outlet.
Junk Diver Feldon of the Third Path Amazing recursion and sac fodder.
Workshop Assistant Reconstruct History Amazing recursion and sac fodder.
Mystic Forge  Laelia, the Blade Reforged Insane card draw engine.
Skullclamp  Pilgrim's Eye  Absurd card draw.
Mishra's Bauble Thopter Engineer Draw 3 for 0 mana with Osgir.
Ugin, the Ineffable Jor Kadeen, the Prevailer Ramp, removal, card draw.
Foundry Inspector Hoard-Smelter Dragon Ramp.
Blinkmoth Urn Unstable Obelisk  Great ramp.
Boros Signet Hedron Archive Way better ramp.
Talisman of Conviction Boros Locket Better ramp.
Soul-Guide Lantern Rip Apart GY Hate.
Lodestone Golem Return to Dust Nice stax.
Scrap Mastery Darksteel Mutation Great recursion.
Austere Command Cleansing Nova  Flexible wipe that avoids artifacts.
Lightning Greaves Excavation Technique Haste enabler and combo finisher.
Crackdown Construct Bosh, Iron Golem Gets infinitely large with Greaves, can be easily tutored and given haste + unblockable.
Kazuul's Fury Temple of the False God Flexible land, can fling the Construct for infinite damage.
Buried Ruin Study Hall Better land.