The Cyber-Controller, Urza, Lord High Artificer, Krark-Clan Ironworks, Mycosynth Golem, and Mycosynth Lattice

Prerequisites

• The Cyber-Controller in the command zone
• Urza, Lord High Artificer on the battlefield
• Krark-Clan Ironworks on the battlefield
• Mycosynth Golem on the battlefield
• Mycosynth Lattice on the battlefield
• You control at least two additional artifacts for each time you've cast The Cyber-Controller from the command zone this game
• NOTE: This combo may fail if the opponents do not mill any creature cards
• Having additional artifacts on the battlefield and/or mana available help mitigate this

Steps

1. Activate Urza's first ability three times by tapping three artifacts you control, adding
2. Cast The Cyber-Controller from the command zone, choosing for X to equal the amount of artifacts you control minus twice the number of times The Cyber-Controller has been cast from the command zone this game, but paying a total of due to Mycosynth Lattice and Mycosynth Golem
3. When The Cyber-Controller enters the battlefield, it triggers, causing each opponent to mill X cards, and then putting all creature cards milled this way onto the battlefield face down under your control as 2/2 Cyberman artifact creatures
4. Activate Urza's first ability by tapping The Cyber-Controller, adding
5. Activate Krark-Clan Ironworks by sacrificing The Cyber-Controller, adding
6. Choose to return The Cyber-Controller to the command zone from your graveyard
7. Repeat from step 2 as able, or until each opponent has milled their library

Results

• Near-infinite mill