Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) while you have 5 or more monsters in your Graveyard and all of them have different names, and cannot be Special Summoned by other ways. Once per turn, during either player's turn: You can send the top 3 cards of your Deck to the Graveyard; if all monsters in your Graveyard have a different name, destroy 1 card on the field.