Progenitor Mimic + Vampire Charmseeker + Time Stretch

Progenitor Mimic

Vampire Charmseeker

Time Stretch

How it works

1. Cast Time Stretch by paying 8, taking two extra turns after this one.
2. At the beginning of your next upkeep, Progenitor Mimic triggers, creating a token copy of Vampire Charmseeker.
3. When the token Vampire Charmseeker enters the battlefield, it triggers itself, returning Time Stretch from your graveyard to your hand.
4. Repeat.

This loop achieves infinite turns by recycling a single copy of Time Stretch through a perpetual creation engine. By casting Time Stretch, you secure the extra time needed to set up your board, sending the spell straight to your graveyard where it waits to be reclaimed. Once Progenitor Mimic is settled on the battlefield as a copy of Vampire Charmseeker, its upkeep trigger generates a fresh token copy of Vampire Charmseeker every turn. As that Vampire Charmseeker enters the battlefield, its triggered ability plucks Time Stretch right back out of your graveyard and into your hand, ready to be cast all over again.