Necrovalley (PSR) [SBC2-ENF14] Prismatic Secret Rare

Set: Speed Duel: Battle City Finals Card type: Field Spell Rarity: Prismatic Secret Rare All "Gravekeeper's" monsters gain 500 ATK/DEF. Cards in the GY cannot be banished. Negate any card effect that would move a card in the GY to a different place. Negate any card effect that changes Types or Attributes in the GY.