Underworld Breach, Diligent Excavator, Thassa's Oracle, and Mirror Image

Prerequisites

• Underworld Breach on the battlefield
• Diligent Excavator on the battlefield
• Thassa's Oracle in hand or in the graveyard or in the library
• Mirror Image on the battlefield
• Mirror Image is a copy of Diligent Excavator
• available

Steps

1. Cast the artifact creature from your hand by paying
2. Diligent Excavator and Mirror Image 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 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

Results

• Infinite self-mill
• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite storm count
• Win the game