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 Yahenni by sacrificing Astrid, giving Yahenni indestructible until end of turn.
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 intricate engine relies on the synergy between Samwise Gamgee and Peregrin Took, which drastically multiplies every token you generate with the help of Academy Manufactor's replacement effect. When Astrid Peth enters the battlefield, she triggers a massive cascade of Clue, Food, and Treasure tokens. By sacrificing Astrid to Yahenni, Undying Partisan, you send her back to the graveyard just in time to use Samwise Gamgee's recursion ability, funded by sacrificing three of your newly minted Foods. Replaying Astrid restarts the loop, allowing you to generate infinite resources, mana, and card draw while growing your board indefinitely.