Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Thermopod, and Strangleroot Geist

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Thermopod on the battlefield
• Strangleroot Geist on the battlefield

Steps

1. Activate Thermopod by sacrificing Strangleroot Geist When Strangleroot Geist dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
2. Activate Thermopod by sacrificing Strangleroot Geist When Strangleroot Geist dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. Strangleroot Geist enters and dies as a state-based action due to having 0 toughness
4. Its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
5. Repeat from step 3

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite red mana
• Infinite sacrifice triggers