You have to add the required number of "Required Cards" and "Selectable Cards" as specified below. You are not required to set one of the "Skills Allowed."

Skills Allowed

• Trap Layer
• Endless Trap Hell
• Chain Reaction
• Bluff Trap

Required Card (1 card)

•  

  Embodiment of Apophis

  Trap

Selectable Cards (8 cards)

•  

  Temple of the Kings

  Spell

•  

  Mystical Beast of Serket

  Effect

•  

  Judgment of Anubis

  Trap

•  

  Curse of Anubis

  Trap

•  

  The Winged Dragon of Ra

  Effect

•  

  Embodiment of Apophis

  Trap