Time Sieve + Academy Manufactor + Tireless Provisioner + Boros Garrison + Elspeth, Storm Slayer

Time Sieve

Academy Manufactor

Tireless Provisioner

Boros Garrison

Elspeth, Storm Slayer

How it works

1. Play Boros Garrison.
2. When Boros Garrison enters, it and Tireless Provisioner trigger
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 Elspeth, Storm Slayer.
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.