Text: ATTACK Once per Round, before your Rival defends: The attack for your next Move this Round can be with a Mono Ally from the top 5 cards of your Main Deck. (Place the rest on the bottom of your Main Deck in any order.)
FAQs/Rulings
When can "Before your Rival defends" be triggered?
“Before your Rival defends” effects can trigger after your Rival has had the opportunity to respond to your attack with a Response card, but before they defend against your attack with their Allies.
If during my next Move after resolving this effect, I do not attack with an Ally from the top card of my Main Deck, do I lose this effect?
Yes, you do.
Does this effect allow me to attack more than once per Move?