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

Underworld Breach

Diligent Excavator

Thassa's Oracle

Clone

How it works

1. Cast the artifact creature from your hand by paying 0.
2. Diligent Excavator and Clone 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 transforms a seemingly harmless 0-mana artifact creature into a devastating engine by leveraging Underworld Breach to recast it from your graveyard over and over again. As you continuously churn that artifact creature through the graveyard, Diligent Excavator treats every single casting as a historic spell, relentlessly milling your entire library into the graveyard. Once your library is completely empty, you simply deploy Thassa's Oracle—either naturally or escaping it with the help of Underworld Breach—and let its blue devotion trigger snatch an instant victory. Meanwhile, Clone plays a vital supporting role by doubling up on your Diligent Excavator triggers to tear through your deck twice as fast.