Ehren, Lightsworn Monk (SDLI-EN011) - Structure Deck: Realm of Light (2020 Date Reprint) Unlimited

Before damage calculation, if this card attacks a Defense Position monster: Shuffle that monster into the Deck. During each of your End Phases: Send the top 3 cards of your Deck to the Graveyard. You must control this face-up card to activate and to resolve this effect.