Mikaeus, the Unhallowed, Spawning Pit, and Carnifex Demon

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Spawning Pit on the battlefield
• Carnifex Demon on the battlefield

Steps

1. Activate Spawning Pit by sacrificing Carnifex Demon
2. When Carnifex Demon 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 Spawning Pit ability Repeat

Results

• Infinite charge counters on a permanent
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers