Underworld Breach, Stitcher's Supplier, Infernal Plunge, and Signpost Scarecrow

Prerequisites

• Underworld Breach on the battlefield
• Stitcher's Supplier on the battlefield
• Infernal Plunge in the graveyard
• Signpost Scarecrow on the battlefield
• available

Steps

1. Cast Infernal Plunge for its escape cost by paying , exling three other cards from your graveyard, and sacrificing Stiticher's Supplier
2. When Stitcher's Supplier dies, it triggers, causing you to mill three cards
3. Resolve Infernal Plunge, adding
4. Activate Signpost Scarecrow by paying , adding
5. Cast Stitcher's Supplier for its escape cost by paying and exling three other cards from your graveyard
6. When Stitcher's Supplier enters the battlefield, it triggers, causing you to mill three cards
7. Repeat

Results

• Infinite self-mill