Emry, Lurker of the Loch, Sewer-veillance Cam, and Grinding Station

Prerequisites

• Emry, Lurker of the Loch on the battlefield
• Sewer-veillance Cam in the graveyard
• Grinding Station on the battlefield

Steps

1. Activate Emry by tapping it, allowing you to cast Sewer-veillance Cam from your graveyard this turn
2. Activate a creature by tapping it, adding at least
3. Cast Sewer-veillance Cam from your graveyard by paying
4. When Sewer-veillance Cam enters, it and Grinding Station trigger
5. Resolve the Sewer-veillance Cam trigger, untapping Emry
6. Resolve the Grinding Station trigger, untapping it
7. Activate Grinding Station by tapping it and sacrificing Sewer-veillance Cam
8. Sewer-veillance Cam triggers, untapping the mana-producing creature
9. Resolve the Grinding Station ability
10. Repeat

Results

• Infinite mill
• Infinite self-mill
• Infinite storm count