While a "Gravekeeper's" monster(s) and "Necrovalley" are both on the field, monsters your opponent controls lose 500 ATK/DEF. Once per turn, during the Main Phase, if you control no card in your Field Zone: You can activate 1 "Necrovalley" directly from your hand or GY. If this card in your possession is destroyed by an opponent's effect and sent to your GY: You can Set 1 "Necrovalley" Spell/Trap directly from your Deck, except "Necrovalley Temple".
When no Field Spell is present Gravekeeper’s Priestess by herself can fulfill the condition for Necrovalley Temple’s debuff effect.
Gravekeeper
Gravekeeper decks have a lot of swarm effects so having a Gravekeeper present would not usually be a problem. Aside from that, their boss monsters Gravekeeper’s Supernaturalist and Gravekeeper’s Visionary have amazing staying power.
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