Blightbeetle, Umbral Collar Zealot, and Bazaar Trader

Prerequisites

• Blightbeetle on the battlefield
• Umbral Collar Zealot on the battlefield
• Bazaar Trader on the battlefield

Steps

1. Donate Blightbeetle to an opponent Activate Umbral Collar Zealot by sacrificing the undying creature
2. When the undying creature dies, its undying ability triggers, returning itself from your graveyard to the battlefield without a +1/+1 counter on it due to Blightbeetle
3. Resolve the Umbral Collar Zealot ability
4. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite surveil 1