Progenitor Mimic + Time Walk + Revolutionist

Progenitor Mimic

Time Walk

Revolutionist

How it works

1. Cast Time Walk by paying its mana cost, taking an extra turn after this one.
2. At the beginning of your next upkeep, Progenitor Mimic triggers, creating a token copy of Revolutionist.
3. When the token Revolutionist enters the battlefield, it triggers itself, returning Time Walk from your graveyard to your hand.
4. Repeat.

This vintage masterpiece establishes an inescapable loop of infinite turns by exploiting the continuous reproduction of Progenitor Mimic. As the Mimic generates a fresh token copy of Revolutionist during each of your upkeeps, the token's entry trigger dips into your graveyard to retrieve Time Walk. With the legendary sorcery safely back in your hand, you simply cast it to take another turn, setting the stage for Progenitor Mimic to churn out yet another Revolutionist and repeat the entire sequence.