Noisy Neighbors
It looks like card’s enactment of “Not THAT Noisy” didn’t update the ruleset, which led to 9spaceking playing Noisy Neighbors on The Red Plains, which in turn became Hostile toward Trigon. But Hostile as an attitude still doesn’t exist. I’ve corrected the card description and made The Red Plains Suspicious of Trigon instead, in the belief that this was the intended effect; CFJ if you disagree.
9spaceking:
unfortunately, nobody pointed out the “hostile” as nonexistent. As such, we can only suppose that the creator of the card intended the “hostile”.