Mikaeus, the Unhallowed, Ashnod's Altar, and Carnifex Demon

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Ashnod's Altar on the battlefield
• Carnifex Demon on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Carnifex Demon
2. When Carnifex Demon dies, its undying ability triggers, returning it from your graveyard to the battlefield without a +1/+1 counter on it due to its replacement effect
3. Repeat

Results

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