Mirran Spy, Emry, Lurker of the Loch, Ornithopter, and Grinding Station

Prerequisites

• Mirran Spy on the battlefield
• Emry, Lurker of the Loch on the battlefield
• Ornithopter on the battlefield
• Grinding Station on the battlefield
• Emry does not have summoning sickness

Steps

1. Activate Grinding Station by tapping it and sacrificing Ornithopter, causing target player to mill three cards
2. Activate Emry by tapping it, targeting Ornithopter
3. Cast Ornithopter from your graveyard by paying
4. Mirran Spy triggers, untapping Emry
5. Ornithopter enters the battlefield, untapping Grinding Station
6. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers
• Near-infinite storm count