Mikaeus, the Unhallowed, Yahenni, Undying Partisan, and Bristlebane Battler

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Yahenni, Undying Partisan on the battlefield
• Bristlebane Battler on the battlefield

Steps

1. Activate Yahenni by sacrificing Bristlebane Battler
2. When Bristlebane Battler 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