This is the Broken Prototype Battlebox. Designed for complete bullshit games of magic the battlebox follows these rules:

• Players share a 100 card deck.
• Players have their own graveyards.
• Players start with 5 cards in hand.
• Players may play lands from their sideboard which consists of:
  • Strip Mine
  • Mana Confluence
  • An Ancient Tomb
  • A Cavern of Souls
  • A Glimmervoid
  • Karakas
  • Bazaar of Baghdad
  • The Tabernacle at Pendrell Vale
  • Spire of Industry
  • Cephalid Coliseum

Players may mulligan once by placing any number of cards from the bottom of their hand onto the bottom of the library and drawing that many cards.