Black Luster Soldier [DPBC-EN006] Super Rare Sealed Product while both have "Gravekeeper's" monster

while both have "Gravekeeper's" monster and "Necrovalley" are on the field: Negate the activation

except "Gladiator Beast Augustus"

You can only use each of these effects of "Darkest Diabolos

While any co-linked "Knightmare" monsters are on the field

Set: Structure Deck: Rise of the True Dragons Card type: Normal Spell Rarity: Common Send 1 monster from your Deck to the Graveyard

Black Luster Soldier [DPBC-EN006] Super Rare Sealed Product while both have "Gravekeeper's" monsterSet: Duelist Pack: Battle City Card type: Ritual Monster Rarity: Super Rare Attack: 3000 Defense: 2500 You can Ritual Summon this card with "Black Luster Ritual".