Activate Thermopod's second ability by sacrificing Su-Chi, adding .
When Su-Chi dies, it triggers, adding CCCC.
Activate Chainer by paying 3 and 3 life, returning Su-Chi to the battlefield from your graveyard.
When Su-Chi enters the battlefield, Verdant Sun's Avatar triggers, causing you to gain life equal to Su-Chi's toughness.
Repeat.
This potent loop hinges on Chainer, Dementia Master and Thermopod working together to continuously recycle Su-Chi from your graveyard. Each time Su-Chi is sacrificed to Thermopod, its death trigger generates four colorless mana while funding the red mana needed to keep the engine going, all smoothly filtered through Chromatic Orrery's ability to let you spend your mana as any color. Meanwhile, Verdant Sun's Avatar ensures that every single return to the battlefield nets you a healthy burst of life to comfortably offset Chainer's life-payment costs, leaving you with boundless mana and lifegain.