Duelingbook Forum

you control gravekeeper's priestess, can the opponent activate necrovalley?

Why couldn't they?

Because the field is treated as necrovally they do not control it so the answer is unclear.

You do realize they can still activate it and it would essentially turn priestess' effect off right?

Also by the logic you're arguing, if you had Necrovalley face-up on the field your opponent couldn't activate theirs. Which isn't how it goes.

Especially not now that Field Spells don't get destroyed when your opponent activates one

do you guys have sources to the official ruling?

I suppose specific rulings weren't released for her, as it has little to no impact in the game.

Both her effects are Continuous, in which the first is only applied while there are no face-up Field Spell Cards. It doesn't prevent new ones being activated, like Field Barrier or Gravekeeper's Shaman, so Priestess doesn't get in your or your opponent's way regarding activating Field Cards.

that works for me.

The continuous effect being applied from priestess does not prevent a field spell from being activated. It simply allows the field to be treated as necrovally if no field spell is present on the field