Progenitor Mimic + Warden of the Eye + Notorious Throng

Progenitor Mimic

Warden of the Eye

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 Warden of the Eye.
4. When the Warden of the Eye token enters the battlefield, it triggers, returning Notorious Throng from your graveyard to your hand.
5. Repeat.

By casting Notorious Throng for its prowl cost after dealing combat damage with a Rogue, you secure your first extra turn and seed your graveyard with the spell. From there, Progenitor Mimic steps in as the engine's heart, its upkeep trigger continuously spawning fresh token copies of Warden of the Eye. Every time a new Warden enters the battlefield, its triggered ability plucks Notorious Throng right back out of your graveyard and into your hand, ready to be cast again during the endless stream of extra turns generated by the loop.