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 Phantom Train by sacrificing Astrid
Activate Samwise Gamgee by sacrificing three Foods, returning Astrid from your graveyard to your hand.
Activate two Treasures by tapping and sacrificing them, adding 1.
Repeat.
This wonderful loop lets you continuously recycle Astrid Peth using Samwise Gamgee's ability to pull her right back from the graveyard, fueled by the staggering economic engine of Academy Manufactor and Peregrin Took multiplying your tokens into a mountain of resources. Every time Astrid is sacrificed to Phantom Train to grow its might and animate it, your surplus of tokens pays the mana and Food-sacrifice costs to loop her endlessly. Along the way, Astrid Peth's exploration ability triggers off your endless Food sacrifices to filter through your deck, turning a humble hobbit and a locomotive into an infinite storm of artifacts, life, and triggers.