Underworld Breach + Diligent Excavator + Thassa's Oracle + Evil Twin

Underworld Breach

Diligent Excavator

Thassa's Oracle

Evil Twin

How it works

1. Cast the artifact creature from your hand by paying 0.
2. Diligent Excavator and Evil Twin trigger, causing you to mill four cards.
3. The artifact creature enters the battlefield and dies as a state-based action due to having zero toughness.
4. Cast the artifact creature from your graveyard for its escape cost by paying 0 and exiling any three cards from your graveyard, except Thassa's Oracle if it is in your graveyard.
5. Repeat from step 2 until you have an empty library.
6. If Thassa's Oracle is in your hand, cast it by paying .
7. Otherwise, cast Thassa's Oracle from your graveyard for its escape cost by paying and exiling three cards from your graveyard.
8. Thassa's Oracle enters the battlefield, causing you to win the game.

This ingenious loop relies on Underworld Breach to let you repeatedly cast a zero-mana artifact creature from your graveyard, turning every iteration into a fuel source for its own escape cost. As you churn through your graveyard, Diligent Excavator acts as your mill engine, steadily dumping your library into the graveyard with every historic spell cast. Evil Twin sits on the battlefield ready to trigger that exact same mill, and can even pick off any mirror-image annoyances if needed. Once your entire library has been successfully binned, you simply escape or cast Thassa's Oracle to trigger its devotion check and instantly win the game.