Text: MY MOVE Once per Round, I can Rest, then Reveal and Discard the top 3 cards of my Main Deck: I Stockpile 1. (Place the top card of my Main Deck into my Stockpile.)
FAQs/Rulings
What does "Reveal and Discard the top 3 cards of my Main Deck" mean?
It means to show your Rival the top 3 cards of your Main Deck and then place them into your Discard Area.
What happens if I attempt to Discard the top 3 cards of my deck and I don't have enough?
The Discarded cards must be returned to the deck in order and the effect does not resolve.