Time Sieve + Academy Manufactor + Parallel Lives + Tireless Tracker + Rakdos Carnarium

Time Sieve

Academy Manufactor

Parallel Lives

Tireless Tracker

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 Parallel Lives.
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.