The Unsealed Forbidden Door

You can only use this Skill's second and third effects once per Duel. 1: At the beginning of your first turn, Set 1 "The Seal of Orichalcos" from outside of your Deck to your field. During this Duel, any effect damage your cards would inflict to your opponent becomes 0, you cannot Special Summon monsters from the Extra Deck, and you can only Normal or Special Summon Machine monsters. 2: If you have activated "The Seal of Orichalcos" this Duel, reveal 1 Level 5 or higher Machine monster in your hand. Choose 3 Level 7 or higher Machine monsters with different names from your Deck. Add 1 of them to your hand, and send the rest to the GY. 3: Send up to 2 monsters from your field to the GY, and add that many number of Level 7 or higher Machine monsters with different names from your Deck to your hand.