Salvaging Station, Clock of Omens, Grinding Station, and Copy Artifact

Prerequisites

• Salvaging Station on the battlefield
• Clock of Omens on the battlefield
• Grinding Station on the battlefield
• Copy Artifact on the battlefield

Steps

1. Activate Salvaging Station by tapping it, returning a noncreature artifact with mana value 1 or less from your graveyard to the battlefield
2. When the artifact enters, Grinding Station and Copy Artifact trigger, untapping themselves
3. Activate Clock of Omens by tapping Copy Artifact and the noncreature artifact returned in step 1, untapping Grinding Station
4. Activate Grinding Station by tapping it and sacrificing the noncreature artifact, causing a player to mill three cards
5. Repeat

Results

• Infinite mill
• Infinite self-mill