Stalwart Successor, Woodfall Primus, and Umbral Collar Zealot

Prerequisites

• Stalwart Successor on the battlefield
• Woodfall Primus on the battlefield
• Umbral Collar Zealot on the battlefield

Steps

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

Results

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