- "Temple of the Kings"'s effect allows you to activate Set Trap Cards. You cannot activate a Trap Card from your hand.
- You must follow any activation requirements that a Set Trap Card may have in order to activate it.
- Sending "Mystical Beast of Serket" to the Graveyard is a cost in order to activate the effect that Special Summons a monster from the Extra Deck.
Mentions in Other Rulings
- Mystical Beast of Serket: This monster can be Normal Summoned while "Temple of the Kings" isn't face-up on the field, but it will be immediately destroyed.
- Mystical Beast of Serket: If "Temple of the Kings" is removed from the field in the middle of resolving a chain, then "Mystical Beast of Serket" is also destroyed at the same time.