Mikaeus, the Unhallowed, Yahenni, Undying Partisan, and Chainbreaker

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Yahenni, Undying Partisan on the battlefield
• Chainbreaker on the battlefield

Steps

1. Activate Yahenni by sacrificing Chainbreaker
2. When Chainbreaker 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. Resolve the Yahenni ability Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers