When Infested Thrinax enters the battlefield, it triggers, causing you to create a number of 1/1 Saproling creature tokens when a nontoken creature you control dies.
Activate Thermopod's second ability by sacrificing Squee, adding .
When Squee dies, Infested Thrinax triggers, creating two 1/1 Saproling creature tokens.
Activate Thermopod's second ability twice by sacrificing the Saprolings, adding 1.
Cast Squee from your graveyard by paying 1.
Repeat from step 3.
This clever loop centers around Thermopod acting as both a permanent sacrifice outlet and a mana engine, converting our creatures into the red mana we need to keep the engine humming. The key to sustaining this cycle is Squee, the Immortal, whose resilient nature allows him to be recast directly from the graveyard over and over again without ever running out of fuel. Meanwhile, Infested Thrinax anchors the entire interaction by translating Squee's tragic demise into a pair of 1/1 green Saproling creature tokens through its enter-the-battlefield trigger, providing the extra sacrifices necessary to generate a net-positive mana stream.