Hidden Temples of Necrovalley is a Rare Spell Card card from Yu-Gi-Oh! (2014 Mega-Tin Mega Pack, MP14). Current market price: $0.21.
Rare
2014 Mega-Tin Mega Pack (MP14)
Card Text
Activate only if both a "Gravekeeper's" monster and "Necrovalley" are on the field. Neither player can Special Summon monsters, except "Gravekeeper's" monsters. If either a "Gravekeeper's" monster or "Necrovalley" is not on the field, destroy this card.
