Sister Hospitaller, Thermopod, and Lagrella, the Magpie Combo

Sister Hospitaller, Thermopod, and Lagrella, the Magpie

Here's how the cards Sister Hospitaller, Thermopod, and Lagrella, the Magpie results in Infinite LTB, Infinite ETB, Infinite sacrifice triggers, Infinite death triggers, Infinite lifegain triggers, Infinite lifegain, and Infinite red mana

Sister Hospitaller

Thermopod

Lagrella, the Magpie

Prerequisites

Sister Hospitaller in hand
Thermopod on the battlefield
Lagrella, the Magpie in the graveyard
available

Steps

Cast Sister Hospitaller by paying
When Sister Hospitaller enters, it triggers, returning Lagrella from your graveyard to the battlefield and causing you to gain life equal to its mana value
When Lagrella enters, it triggers, exiling Sister Hospitaller until Lagrella leaves the battlefield
Activate Thermopod by sacrificing Lagrella
When Lagrella leaves the battlefield, Sister Hospitaller is returned from exile to the battlefield
Repeat from step 2