Umbral Collar Zealot, Thran Vigil, and Safehold Elite

Prerequisites

• Umbral Collar Zealot on the battlefield
• Thran Vigil on the battlefield
• Safehold Elite on the battlefield

Steps

1. Activate Umbral Collar Zealot by sacrificing Safehold Elite
2. When Safehold Elite 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 Safehold Elite
4. Resolve the Umbral Collar Zealot ability
5. Repeat

Results

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