Underworld Breach + Diligent Excavator + Thassa's Oracle + Quicksilver Gargantuan

Underworld Breach

Diligent Excavator

Thassa's Oracle

Quicksilver Gargantuan

How it works

1. Cast the artifact creature from your hand by paying 0.
2. Diligent Excavator and Quicksilver Gargantuan 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 fragile artifact creature into an infinite recycling engine by leveraging Underworld Breach, which grants every card in your graveyard escape. As you repeatedly cast and let the creature succumb to state-based actions, Diligent Excavator acts as your mill-churning motor, feeding cards back into the graveyard to pay those escape costs while steadily reducing your library to zero. To ensure your copies don't disrupt the math, Quicksilver Gargantuan can safely clone whatever creature is needed—or you can rely on the original to keep the chain flowing. Once your library is completely gone, you simply deploy Thassa's Oracle to capitalize on your devotion to blue and instantly claim victory.