Spawning Pit, and Thunderous Velocipede

Prerequisites

• Spawning Pit on the battlefield
• Thunderous Velocipede 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 and at least one +1/+1 counter on it due to Thunderous Velocipede
3. Remove a -1/-1 counter and a +1/+1 counter from that creature as a state-based action
4. Resolve the Spawning Pit ability
5. Repeat

Results

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