Time Sieve + Academy Manufactor + Golgari Rot Farm + Tireless Provisioner + Xorn

Time Sieve

Academy Manufactor

Golgari Rot Farm

Tireless Provisioner

Xorn

How it works

1. Play Golgari Rot Farm.
2. Golgari Rot Farm enters the battlefield, triggering itself and Tireless Provisioner.
3. Resolve the Golgari Rot Farm 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.