Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Phyrexian Altar, and Threefold Thunderhulk

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Phyrexian Altar on the battlefield
• Threefold Thunderhulk on the battlefield

Steps

1. Activate Phyrexian Altar 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. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite colored mana
• Infinite creature tokens
• Infinite death triggers
• Infinite sacrifice triggers