Mikaeus, the Unhallowed, Chainbreaker, and Phyrexian Altar

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Chainbreaker on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Chainbreaker, adding one mana of any color
2. Chainbreaker dies, triggering its undying ability, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. Repeat

Results

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