Progenitor Mimic + Eternal Witness + Notorious Throng

Prerequisites

• Progenitor Mimic on the battlefield as a copy of Eternal Witness.
• You control at least one Rogue that does not have summoning sickness and cannot be blocked by an opponent.

Steps

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

Effects

• Infinite turns
• Lock