Spawning Pit, and Thran Vigil

Prerequisites

• Spawning Pit on the battlefield
• Thran Vigil on the battlefield

Steps

1. Activate Spawning Pit by sacrificing the creature with persist
2. When that creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. Thran Vigil triggers, putting a +1/+1 counter on that creature
4. Remove a +1/+1 counter and a -1/-1 counter from that creature as a state-based action
5. Resolve the Spawning Pit ability from step 1
6. Repeat

Results

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