Assuming Direct Control

Commander / EDH Artifact Artificer Control Counters Counterspell Mono-Blue

HerrDexter

Creature (26)

• 1x Stonecoil Serpent
• 1x Etherium Sculptor
• 1x Faerie Mastermind
• 1x Gilded Drake
• 1x Myr Retriever
• 1x Steel Overseer
• 1x Thieving Skydiver
• 1x Emry, Lurker of the Loch
• 1x Foundry Inspector
• 1x Master of Etherium
• 1x Scrapyard Recombiner
• 1x Treasure Mage
• 1x Tribute Mage
• 1x Trinket Mage
• 1x Trophy Mage
• 1x Clever Impersonator
• 1x Jhoira's Familiar
• 1x Master Transmuter
• 1x Padeem, Consul of Innovation
• 1x Urza, Lord High Artificer
• 1x Darksteel Juggernaut
• 1x Wandering Archaic  ^Flip
• 1x Shimmer Dragon
• 1x Agent of Treachery
• 1x Platinum Emperion
• 1x Metalwork Colossus

Sorcery (5)

• 1x Ponder
• 1x Mind Spring
• 1x One with the Machine
• 1x Thoughtcast
• 1x All is Dust

Planeswalker (2)

• 1x Tezzeret, Betrayer of Flesh
• 1x Ugin, the Ineffable

Land (35)

• 1x Academy Ruins
• 1x Ancient TombGC
• 1x Castle Vantress
• 1x Darksteel Citadel
• 1x Detection Tower
• 1x Halimar Depths
• 1x Inventors' Fair
• 16x Island
• 1x Memorial to Genius
• 1x Mishra's WorkshopGC
• 1x Mystic Sanctuary
• 1x Reliquary Tower
• 1x Riptide Laboratory
• 1x Rishadan Port
• 1x Sanctum of Eternity
• 1x Seat of the Synod
• 1x Tolaria West
• 1x Tyrite Sanctum
• 1x Urza's Saga
• 1x Zhalfirin Void

Instant (11)

• 1x Pact of Negation
• 1x Brainstorm
• 1x Counterspell
• 1x Cyclonic RiftGC
• 1x Mana Drain
• 1x Pull from Tomorrow
• 1x Archmage's Charm
• 1x Disallow
• 1x Reins of Power
• 1x Rewind
• 1x Commandeer

Commander (1)

Artifact (16)

• 1x Manifold Key
• 1x Sensei's Divining Top
• 1x Sol Ring
• 1x Grim MonolithGC
• 1x Liquimetal Coating
• 1x Liquimetal Torque
• 1x Mind Stone
• 1x Swiftfoot Boots
• 1x Midnight Clock
• 1x Pristine Talisman
• 1x Hedron Archive
• 1x Lithoform Engine
• 1x Thran Dynamo
• 1x Unwinding Clock
• 1x Blinkmoth Urn
• 1x Caged Sun

Enchantment (4)

• 1x Telepathy
• 1x Training Grounds
• 1x Artificer Class
• 1x Curator's Ward

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Win Cons:

• Use your mana rocks and Memnarch to steal your opponent's valuable cards!
• If you get wiped and someone has full board, plan B: Reins of Power

Highlights:

• Running theme is mind-control and blatant thievery: Memnarch (duh), Agent of Treachery, Thieving Skydiver, Gilded Drake, Commandeer and to some extent Wandering Archaic
• If your opponent destroys a crucial artifact, your Myr Retriever, Emry, Lurker of the Loch and Academy Ruins will bring it back
• 3 cards that lower artifact casting cost: Foundry Inspector, Jhoira's Familiar and Etherium Sculptor
• 3 cards that get along with Memnarch abilities like bread and butter: Training Grounds, Liquimetal Coating and Liquimetal Torque

Tutors:

• Trinket Mage can fetch Sol Ring, Voltaic Key or Stonecoil Serpent
• Tribute Mage can fetch Grim MonolithGC, Swiftfoot Boots (those are important!), Liquimetal Coating / Liquimetal Torque or Etherium Sculptor
• Trophy Mage can fetch Foundry Inspector, Pristine Talisman, Midnight Clock or Scrapyard Recombiner
• Treasure Mage can fetch Caged Sun, Platinum Emperion, Metalwork Colossus or Steel Hellkite
• Tolaria West can fetch Stonecoil Serpent, Pact of Negation and, most importantly, lands like Ancient TombGC or Mishra's WorkshopGC
• Inventors' Fair can fetch any artifact as long as you already have 3 on the battlefield.
• Scrapyard Recombiner with a bit of sacrifice can fetch Metalwork Colossus, Foundry Inspector or Steel Overseer

Also, this:

Date added	6 years
Last updated	5 months
Legality	This deck is Commander / EDH legal.
Rarity (main - side)	9 - 0 Mythic Rares 47 - 0 Rares 17 - 0 Uncommons 10 - 0 Commons
Cards	100
Avg. CMC	3.34
Tokens	Construct 0/0 C, Copy Clone, Emblem Tezzeret, Betrayer of Flesh, Spirit 2/2 C
Folders	Commander / EDH, monoblue, memnarch mono blue steal, Other's, To Play