Progenitor Mimic + Timeless Witness + Notorious Throng

Progenitor Mimic

Timeless Witness

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, taking an extra turn after this one.
3. At the beginning of your next upkeep, Progenitor Mimic triggers, creating a token copy of Timeless Witness.
4. When the token Timeless Witness enters the battlefield, it triggers itself, returning Notorious Throng from your graveyard to your hand.
5. Repeat.