Text: You must be a Villain. END OF RIVAL’S MOVE Once per Round, Reveal and Discard 1 card from your hand: Rest 1 of your Rival’s Crystals. You can Stockpile 1. (Place the top card of your Main Deck into your Stockpile.)
FAQs/Rulings
Can multiples of the same card use a "Once per Round" effect?
No. “Once per Round” effects can only be used once each Round across all cards that share a name and tag.
What does "Reveal and Discard" mean?
It means to show you Rivals a card from your hand, then place it into your Discard Area.
Can I Stockpile 1 if all of my Rival's Crystals are Rested?