Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Umbral Collar Zealot, and Threefold Thunderhulk

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Umbral Collar Zealot on the battlefield
• Threefold Thunderhulk on the battlefield

Steps

1. Activate Umbral Collar Zealot by sacrificing Threefold Thunderhulk
2. When Threefold Thunderhulk dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to its replacement effect
3. When Threefold Thunderhulk enters, it triggers, creating a number of 1/1 Golem artifact creature tokens equal to its power
4. Resolve the Umbral Collar Zealot ability
5. Repeat

Results

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