Umbral Collar Zealot, and Surrak and Goreclaw

Prerequisites

• Umbral Collar Zealot on the battlefield
• Surrak and Goreclaw on the battlefield

Steps

1. Activate Umbral Collar Zealot 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, Surrak and Goreclaw triggers, putting a +1/+1 counter on the persist creature
4. Resolve the Umbral Collar Zealot ability
5. Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite creature sacrifice triggers
• Infinite surveil