Underworld Breach + Diligent Excavator + Thassa's Oracle + Chameleon, Master of Disguise

Underworld Breach

Diligent Excavator

Thassa's Oracle

Chameleon, Master of Disguise

How it works

1. Cast the artifact creature from your hand by paying 0.
2. Diligent Excavator and Chameleon 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 fascinating loop centers on Underworld Breach, which grants your graveyard escape so you can repeatedly cast a zero-mana artifact creature—copied by Chameleon, Master of Disguise—over and over again by exiling your other spent resources. As you continuously cast and sacrifice that creature, Diligent Excavator turns every single repetition into a mill trigger that strips your entire library down to nothing. Once your deck is completely empty, you can finally deploy Thassa's Oracle from your hand or escape it from your graveyard, letting its enter-the-battlefield trigger see your zero-card library and instantly win you the game.