Effect
Gains 200 DEF for each "Gravekeeper's" monster in your GY. Negate all monster effects that activate in the GY, except "Gravekeeper's" monsters. While "Necrovalley" is on the field, your opponent cannot activate Field Spell Cards, also Field Spell Cards cannot be destroyed by your opponent's card effects.
The effect "This card gains 200 DEF for each 'Gravekeeper's' monster in your Graveyard" is a Continuous Effect. (This effect is applied even if "Necrovalley" is not on the field.)
The effect "As long as this card remains face-up on the field, the effects of Effect Monsters that activate in the Graveyard, except 'Gravekeeper's' monsters, are negated" is a Continuous Effect. (This effect is applied even if "Necrovalley" is not on the field.)
The effect "Your opponent cannot activate Field Spell Cards, and Field Spell Cards cannot be destroyed by your opponent's card effects" is a Continuous Effect. (This effect is only applied while "Necrovalley" is on the field.)
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