NecroValley

Ref: DL3-001

As long as this card remains face-up on the field, all effects of Magic, Trap and / or effect Monster cards that involve graveyards are negated and neither player can remove cards in the Graveyards from play. In addition, increase the ATK and DEF of all Monsters that include Gravekeepers in their card name by 500 points.

Field Magic cards allow you to modify the strength of all applicable Monsters on the field, both your own and your opponent's. They must be Set or activated in the Field Card Zone and only one Field Card can be activated at one time. When your opponent activates a new Field Card, then your Field Card must be sent to the Graveyard. You cannot Set or activate a new Field Card of your own until your current Field Card is destroyed.