In Papa's Footsteps (LEDE-EN070) [Legacy of Destruction]

If a card(s) is sent to the GY, except "In Papa's Footsteps": Banish up to 5 cards from your GY, face-down, then if 7 or more of your cards are currently banished face-down, your opponent banishes as many cards as possible from their GY (max. 5) face-down.