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mtg-online-drafter/docs/development/mtg-rulebook/standard-pack-generation-algorithm.md

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Slots 1-6 (Commons): 6 Common cards. Ensure color balance (attempt to include at least 3 distinct colors). Slot 7 (Common/List Slot):

  • Roll a d100.
  • 1-87: 1 Common from Main Set.
  • 88-97: 1 Card from "The List" (Common/Uncommon reprint).
  • 98-99: 1 Rare/Mythic from "The List".
  • 100: 1 Special Guest (High Value). Slots 8-10 (Uncommons): 3 Uncommon cards. Slot 11 (Main Rare Slot):
  • Roll 1d8.
  • If 1-7: Rare.
  • If 8: Mythic Rare. Slot 12 (Land): 1 Basic or Common Dual Land (20% chance of Foil). Slot 13 (Non-Foil Wildcard):
  • Can be any rarity (Common, Uncommon, Rare, Mythic).
  • Use weighted probability: ~49% Common, ~24% Uncommon, ~13% Rare, ~13% Mythic.
  • Can be a card from the child sets. Slot 14 (Foil Wildcard):
  • Same rarity weights as Slot 13, but the card must be Foil. Slot 15 (Marketing): Token or Art Card.