Let's Go Together (ALIN-EN068) - Alliance Insight 1st Edition

If you have no "Let's Go Together" in your face-up field, GY, nor banishment: Banish 7 cards from the top of your Deck, face-down; make your opponent banish 7 cards from their Extra Deck and/or top of their Deck, face-down, and they must declare how many are banished from each beforehand.