Basri's Lieutenant, Securitron Squadron, and Umbral Collar Zealot

Prerequisites

• Basri's Lieutenant on the battlefield
• Securitron Squadron on the battlefield
• Umbral Collar Zealot on the battlefield

Steps

1. Activate Umbral Collar Zealot by sacrificing a creature with at least one +1/+1 counter
2. Basri's Lieutenant triggers, creating a 2/2 Knight creature token
3. When Knight token enters the battlefield, Securitron Squadron triggers, putting a +1/+1 counter on the Knight
4. Resolve the Umbral Collar Zealot ability Repeat

Results

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