Mikaeus, the Unhallowed, Cinderhaze Wretch, and Ashnod's Altar

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Cinderhaze Wretch on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Cinderhaze Wretch, adding
2. Cinderhaze Wretch dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it
3. Activate Cinderhaze Wretch's second ability by putting a -1/-1 counter on it, untapping it
4. Repeat

Results

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