Gem-Knight Lady Lapis Lazuli (SECE-EN046) - Secrets of Eternity Unlimited

"Gem-Knight Lapis" + 1 "Gem-Knight" monster
Must first be Fusion Summoned with the above Fusion Materials. You can only Special Summon "Gem-Knight Lady Lapis Lazuli(s)" once per turn. Once per turn: You can send 1 "Gem-Knight" monster from your Main Deck or Extra Deck to the Graveyard, and if you do, inflict 500 damage to your opponent for each Special Summoned monster on the field.