Text: Your MC must be a Villain. You must Drop 1 to trigger this from your hand. ATTACK RESPONSE When your Rival attacks with an MC, Mono Ally, or Dual Ally [1]: Nullify its attack.
FAQs/Rulings
What does "Drop 1" mean?
It means to place 1 card from your hand on the bottom of your Main Deck.
When this card's condition is met, am I required to trigger its effect?
No, Crystal costs are optional and must only be paid if you wish to use the effect.