Time Sieve + Academy Manufactor + Tireless Provisioner + Xorn + Boros Garrison

Time Sieve

Academy Manufactor

Tireless Provisioner

Xorn

Boros Garrison

How it works

1. Play Boros Garrison.
2. Boros Garrison enters the battlefield, triggering itself and Tireless Provisioner.
3. Resolve the Boros Garrison trigger, returning it from the battlefield to your hand.
4. Resolve the Tireless Provisioner trigger, creating two Treasure, two Clue and two Food artifact tokens due to Academy Manufactor and Xorn.
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.