When The Cyber-Controller enters, each opponent mills X cards. Put all creature cards milled this way onto the battlefield face down under your control. They're 2/2 Cyberman artifact creatures.
Other artifact creatures you control get +1/+1.
Cast The Cyber-Controller, mill your opponents, and steal every creature you hit as a face-down 2/2 artifact Cyberman that your anthem immediately pumps. From there you build a wide board of artifact creatures, recur the Controller to keep harvesting opponents' libraries, and close with anthem-boosted swings, sacrifice payoffs, or artifact-token synergies.
Repeatable theft and mill that grows your board while attacking opponents' libraries
Built-in anthem makes every artifact creature and stolen Cyberman bigger
Cheap 3-mana body in efficient Dimir colors with strong recursion and protection options
Synergizes with both artifact-matters and Cyberman/typal payoffs
Wraths and board wipes hit your whole go-wide plan and the anthem at once
Stolen creatures arrive as vanilla 2/2s, losing their abilities
Relies on opponents milling actual creatures—creature-light pods give little value
Removal of the Controller shrinks every other artifact creature you control
Slashes activation costs across an artifact-heavy build full of expensive abilities.
Add fast mana and recursion (Phyrexian Reclamation, Feldon-style loops, sac altars) to recast the Controller every turn for relentless theft and mill. Lean into either an aristocrats package (Blood Artist, Zulaport Cutthroat, free sac outlets) or an artifact-combo engine (Urza, Training Grounds, cost reducers) for deterministic kills. Protect your investment with counterspells and instant-speed protection so a single wrath doesn't erase the anthem and your whole board.