Grapha, Dragon Lord of Dark World (SDGU-EN001) [Structure Deck: Gates of the Underworld]

You can Special Summon this card (from your Graveyard) by returning 1 face-up "Dark World" monster you control to the hand, except "Grapha, Dragon Lord of Dark World". If this card is discarded to the Graveyard by a card effect: Target 1 card your opponent controls, destroy that target, then, if this card was discarded from your hand to your Graveyard by an opponent's card effect, look at 1 random card in your opponent's hand, then, if it was a monster, you can Special Summon it to your side of the field.