Mikaeus, the Unhallowed, Ashnod's Altar, and Bristlebane Battler

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Ashnod's Altar on the battlefield
• Bristlebane Battler on the battlefield

Steps

1. Activate Ashnod's Altar 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. Repeat

Results

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