Underworld Breach + Diligent Excavator + Thassa's Oracle + Synth Infiltrator
How it works
- Cast the artifact creature from your hand by paying 0.
- Diligent Excavator and Synth Infiltrator trigger, causing you to mill four cards.
- The artifact creature enters the battlefield and dies as a state-based action due to having zero toughness.
- 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.
- Repeat from step 2 until you have an empty library.
- If Thassa's Oracle is in your hand, cast it by paying .
- Otherwise, cast Thassa's Oracle from your graveyard for its escape cost by paying and exiling three cards from your graveyard.
- Thassa's Oracle enters the battlefield, causing you to win the game.
This clever loop turns zero-mana casting mechanics into a complete self-mill engine by relying on Underworld Breach to let you continuously recast a zero-toughness artifact creature from your graveyard for its escape cost. As you churn this creature through the graveyard over and over, Diligent Excavator turns every single cast into a historic trigger that mills away your library piece by piece. Synth Infiltrator steps in as a key enabler by providing the zero-mana artifact creature that makes the loop frictionless, ensuring you can keep feeding cards to Underworld Breach. Once your library has been completely dissolved into the graveyard, you finish off the opponent by casting Thassa's Oracle, whose enters-the-battlefield trigger instantly claims victory since your blue devotion easily outnumbers your zero remaining cards.