Mikaeus, the Unhallowed, Thermopod, and Gravelgill Axeshark

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Thermopod on the battlefield
• Gravelgill Axeshark on the battlefield

Steps

1. Activate Thermopod by sacrificing Gravelgill Axeshark
2. When Gravelgill Axeshark dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. Activate Thermopod by sacrificing Gravelgill Axeshark
4. When Gravelgill Axeshark dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
5. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite red mana
• Infinite sacrifice triggers