Time Sieve + Academy Manufactor + Guildless Commons + Tireless Tracker + Elspeth, Storm Slayer

Time Sieve

Academy Manufactor

Guildless Commons

Tireless Tracker

Elspeth, Storm Slayer

How it works

1. Play Guildless Commons.
2. When Guildless Commons enters, it and Tireless Tracker trigger
3. Resolve the Guildless Commons 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 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.