Cast Crown of Flames by paying , targeting any creature you control.
When Crown of Flames enters the battlefield, Chishiro triggers, creating two 2/2 Spirit creature tokens.
Activate Thermopod's second ability twice by sacrificing the Spirits, adding .
Activate Crown of Flames' second ability by paying , returning it from the battlefield to your hand.
Repeat.
This fascinating loop transforms the modest re-buyable enchantment Crown of Flames into an engine for endless sacrifice and creature triggers. Because Chishiro, the Shattered Blade rewards you with a menacing Spirit whenever an Aura enters, and Doubling Season happily doubles that output into two tokens per cycle, you are constantly generating fresh fodder for Thermopod's altar. You simply sacrifice the newly minted spirits to feed Thermopod's mana ability, using that very red mana to bounce Crown of Flames right back to your hand and cast it all over again in an endless, self-sustaining loop.