Underworld Breach + Diligent Excavator + Thassa's Oracle + Moritte of the Frost

Underworld Breach

Diligent Excavator

Thassa's Oracle

Moritte of the Frost

How it works

1. Cast the artifact creature from your hand by paying 0.
2. Diligent Excavator and Moritte of the Frost 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 mesmerizing loop turns a humble zero-mana artifact creature—duplicated by Moritte of the Frost to double up on our milling engine—into an infinite self-mill machine, fueled entirely by Underworld Breach's escape mechanic recycling our graveyard. Every time the creature hits the battlefield and immediately perishes to state-based actions, Diligent Excavator turns that cycle into four milled cards, feeding the very escape costs we need to cast it over and over again. Once our entire library has been successfully binned, we cap off the sequence by dropping Thassa's Oracle, whose devotion check instantly translates our empty deck into a glorious victory.