Mikaeus, the Unhallowed, Solemnity, and Thermopod

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Solemnity on the battlefield
• Thermopod on the battlefield

Steps

1. Activate Thermopod's second ability by sacrificing it, adding
2. When Thermopod dies, its undying ability triggers, returning it to the battlefield from your graveyard with zero +1/+1 counters due to Solemnity
3. Repeat

Results

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