Time Sieve + Academy Manufactor + Conjurer's Closet + Gilded Goose + Panharmonicon

Time Sieve

Academy Manufactor

Conjurer's Closet

Gilded Goose

Panharmonicon

How it works

1. At the beginning of your end step, Conjurer's Closet triggers, blinking Gilded Goose.
2. When Gilded Goose enters the battlefield, it triggers twice, creating two Food, two Clue and two Treasure artifact tokens due to Academy Manufactor.
3. Activate Time Sieve by tapping it and sacrificing five artifact tokens, causing you to take an extra turn after this one.
4. Repeat.

This recursive engine spins out of control during your end step, when Conjurer's Closet exiles and returns Gilded Goose to the battlefield. Because Panharmonicon doubles the Goose's entry trigger—and Academy Manufactor magnifies any single Food creation into a full trio of a Clue, Food, and Treasure token—that single blink yields a full six artifacts. You can then immediately tap and sacrifice five of those newly minted tokens to Time Sieve, paying the exact cost required to take an extra turn after this one.