Warbeast of Gorgoroth, Umbral Collar Zealot, and Primal Vigor

Prerequisites

• Warbeast of Gorgoroth on the battlefield
• Umbral Collar Zealot on the battlefield
• Primal Vigor on the battlefield

Steps

1. Activate Umbral Collar Zealot by sacrificing the creature with power 4 or greater
2. When the creature dies, Warbeast of Gorgoroth triggers, creating a 0/0 Army creature token if you don't control one, then putting four +1/+1 counters on an Army you control
3. Resolve the Umbral Collar Zealot ability, causing you to surveil 1 Repeat

Results

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