When a Spell Card, Trap Card, or monster effect is activated, while both a "Gravekeeper's" monster and "Necrovalley" are on the field: Negate the activation, and if you do, destroy it. You can only activate 1 "Imperial Tombs of Necrovalley" per turn.
![Imperial Tombs of Necrovalley [MP14-EN235] Secret Rare](http://www.dungeonsandjavas.com/cdn/shop/products/8e4a8221-bb92-584d-abeb-43a29b012130.png?v=1682557173&width=1445)
