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 [LVAL-EN076] Secret Rare](http://www.cardmerchanttakapuna.co.nz/cdn/shop/products/5a7a7fa7-c474-5e3a-b5ee-f538d9f080b3.png?v=1698552591&width=1445)