Celes, Rune Knight, and Spawning Pit

Prerequisites

• Celes, Rune Knight on the battlefield
• Spawning Pit on the battlefield

Steps

1. Activate Spawning Pit by sacrificing the persist creature
2. When the persist creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. When the persist creature enters the battlefield, Celes's second ability triggers, putting a +1/+1 counter on each creature you control
4. Resolve the Spawning Pit ability
5. Repeat

Results

• Infinite +1/+1 counters on creatures you control
• Infinite charge counters on a permanent
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers