Time Sieve + Academy Manufactor + Tireless Tracker + Primal Vigor + Rakdos Carnarium

Time Sieve

Academy Manufactor

Tireless Tracker

Primal Vigor

Rakdos Carnarium

How it works

1. Play Rakdos Carnarium.
2. When Rakdos Carnarium enters, it and Tireless Tracker trigger
3. Resolve the Rakdos Carnarium trigger, returning it from the battlefield to your hand.
4. Resolve the Tireless Tracker trigger, creating two Treasure, two Clue and two Food artifact tokens due to Academy Manufactor and Primal Vigor.
5. Activate Time Sieve by tapping it and sacrificing five of the artifact tokens, causing you to take an extra turn after this one.
6. Repeat each turn.

This ingenious engine achieves infinite turns by repeatedly looping land drops to fuel Time Sieve's ultimate demand. Every time Rakdos Carnarium enters the battlefield, Tireless Tracker triggers to investigate, and the replacement effects of Academy Manufactor and Primal Vigor multiply that single Clue into a bountiful harvest of two Clues, two Foods, and two Treasures. You can then use those generated artifacts to pay the five-sacrifice cost for Time Sieve, taking an extra turn so you can simply replay Rakdos Carnarium from your hand and repeat the entire loop indefinitely.