Underworld Breach + Stitcher's Supplier + Infernal Plunge + Stonework Packbeast

Underworld Breach

Stitcher's Supplier

Infernal Plunge

Stonework Packbeast

How it works

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 Stonework Packbeast by paying 2, 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.

This elegant loop relies on Underworld Breach to turn your graveyard into a second hand, giving your fallen spells and creatures escape so they can be recast over and over. By sacrificing Stitcher's Supplier to pay for Infernal Plunge, you trigger the Supplier's death ability to aggressively mill cards into your graveyard, fueling the escape costs needed to keep the chain going. Meanwhile, Stonework Packbeast acts as a crucial color-fixing engine, converting the red mana generated by Infernal Plunge into the black mana required to recast Stitcher's Supplier from the graveyard.