Ok, I didn't know the answer to this question.
I have Three Nails active and my opponent has a demon in The Pit. During battle, I play Trumpet Blast on my teal hero to discard The Pit. At that point, does Three Nails now kick back in, ignoring the demon in battle?
As Three Nails is only negated while a demon is in The Pit, does the negate lift mid-battle?
The Pit - "Holder may place a demon with a toughness of */7 or greater on this fortress (or return it to territory) during his preparation phase. While a demon is here, negate Three Nails."
Three Nails - "No demon may block while this Artifact is in play." • Play As: "All Heroes ignore demons."
Kirk