Underworld Breach + Diligent Excavator + Thassa's Oracle + Gigantoplasm

Underworld Breach

Diligent Excavator

Thassa's Oracle

Gigantoplasm

How it works

1. Cast the artifact creature from your hand by paying 0.
2. Diligent Excavator and Gigantoplasm 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 clever loop turns zero-cost artifact creatures into a self-milling engine by utilizing Underworld Breach to repeatedly escape the creature from your graveyard, all while fueling itself by exiling other unwanted cards. Every time you cast it—or when Gigantoplasm copies a piece of the puzzle—Diligent Excavator triggers to mill your library deeper and deeper until you have no cards left. Once your library is completely empty, you finish off the opponent by casting Thassa's Oracle, whose enters-the-battlefield ability checks your devotion and claims an immediate victory.