Woodfall Primus, Umbral Collar Zealot, and Thran Vigil

Prerequisites

• Woodfall Primus on the battlefield
• Umbral Collar Zealot on the battlefield
• Thran Vigil on the battlefield

Steps

1. Activate Umbral Collar Zealot by sacrificing Woodfall Primus
2. When Woodfall Primus dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. Thran Vigil and Woodfall Primus trigger
4. Resolve the Thran Vigil trigger, putting a +1/+1 counter on Woodfall Primus
5. Resolve the Woodfall Primus trigger, destroying target noncreature permanent
6. Resolve the Umbral Collar Zealot ability Repeat

Results

• Destroy any number of noncreature permanents
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinite surveil
• Lock