How can you create a combo with Underworld Breach, Stitcher's Supplier, Infernal Plunge, Stonework Packbeast?
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[START OF COMBO]This combo can be formed with Underworld Breach, Stitcher's Supplier, Infernal Plunge, Stonework Packbeast

Color identity: BR
Mana cost: {R}
Steps:
  1. Cast Infernal Plunge for its escape cost by paying {R}, 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 {R}{R}{R}.
  4. Activate Stonework Packbeast by paying {2}, adding {B}.
  5. Cast Stitcher's Supplier for its escape cost by paying {B} 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.[END OF COMBO STEPS]

Result:
  - Infinite self-mill[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Underworld Breach must be on the battlefield
  - Stitcher's Supplier must be on the battlefield
  - Infernal Plunge must be in the graveyard
  - Stonework Packbeast must be on the battlefield
  - You have at least three additional cards in your graveyard.
[END OF COMBO PREREQUISITES]
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