Sillva, Warlord of Dark World (SR13-EN008) [Structure Deck: Dark World]

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