Time Sieve + Academy Manufactor + Gruul Turf + Tireless Tracker + Elspeth, Storm Slayer

Time Sieve

Academy Manufactor

Gruul Turf

Tireless Tracker

Elspeth, Storm Slayer

How it works

1. Play Gruul Turf.
2. When Gruul Turf enters, it and Tireless Tracker trigger
3. Resolve the Gruul Turf 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.