Mikaeus, the Unhallowed, Grinding Station, and Dread Tiller

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Grinding Station on the battlefield
• Dread Tiller on the battlefield

Steps

1. Activate Grinding Station by tapping it and sacrificing Dread Tiller
2. When Dread Tiller dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
3. When Dread Tiller enters the battlefield, it and Grinding Station trigger
4. Resolve the Dread Tiller trigger, putting a -1/-1 counter on it
5. Resolve the Grinding Station trigger, untapping it
6. Resolve the Grinding Station ability from step 1
7. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill