When Astrid enters the battlefield, its first ability and Samwise Gamgee trigger.
Resolve the Astrid trigger, creating two Clue, two Food and two Treasure tokens.
Resolve the Samwise Gamgee trigger, creating two Clue, two Food and two Treasure tokens.
Activate Thermopod's second ability by sacrificing Astrid, adding .
Activate Samwise Gamgee by sacrificing three Foods, returning Astrid from your graveyard to your hand.
Activate a Treasure by tapping and sacrificing it, adding .
Repeat.
This delightful loop relies on a clever pyramid of token-doubling and replacement effects to turn a single creature into an infinite engine. When Astrid Peth enters the battlefield, Samwise Gamgee triggers to make a Food, but Peregrin Took and Academy Manufactor step in to multiply that single creation into an avalanche of Clues, Foods, and Treasures. With your newly generated artifacts fueling your mana needs, you can sacrifice Astrid Peth to Thermopod for red mana, and then use Samwise Gamgee's ability—relying on your massive hoard of Food tokens—to return Astrid straight back to your hand so the whole cycle can begin anew.