Sillva, Warlord of Dark World (DR04-EN083) - Dark Revelation Volume 4 Unlimited

If this card is discarded to the Graveyard by a card effect: Special Summon it from the Graveyard, then, if this card was discarded from your hand to your Graveyard by your opponent's card effect, your opponent returns exactly 2 cards from their hand to the bottom of their Deck, in any order.