Progenitor Mimic + Vampire Charmseeker + Notorious Throng

Progenitor Mimic

Vampire Charmseeker

Notorious Throng

How it works

1. Deal combat damage to an opponent using a Rogue.
2. Cast Notorious Throng for its prowl cost by paying 5, causing you to take an extra turn after this one.
3. At the beginning of your next upkeep, Progenitor Mimic triggers, creating a token copy of Vampire Charmseeker.
4. When the Vampire Charmseeker token enters the battlefield, it triggers, returning Notorious Throng from your graveyard to your hand.
5. Repeat.

This looping setup uses the recursive trigger of Vampire Charmseeker to endlessly recycle extra turns, backed by the tribal synergy of Notorious Throng. Once you slip past defenses with a Rogue to cast Notorious Throng for its prowl cost, you secure your first extra turn and seed the graveyard with the spell. From there, Progenitor Mimic steps in during your upkeep to steadily churn out token copies of Vampire Charmseeker, each one pulling Notorious Throng right back to your hand for the next cycle.