Building a Diorama

Can be used during a Duel where you have Ritual Summoned a Ritual Monster whose original Level is 8 or higher. Add 1 Field Spell Card from your Deck to your hand. Then, return 1 card from your hand to the bottom of your Deck.
This Skill can only be used if you begin the Duel with a Deck that contains at least 4 Ritual Monsters and 4 Ritual Spell Cards. This Skill can only be used once per Duel.