Historical Rules · 20 November 2020
Rule 702.16p
Official source text from the 20 November 2020 Rules release
One Aura (Benevolent Blessing) gives the enchanted creature protection from a quality and says the effect doesn’t remove certain permanents that are “already attached to” that creature. This means that any object with the stated quality attached to that creature at the moment the protection effect starts to apply (including the Aura giving the permanent protection) aren’t put into their owners’ graveyards as a state-based action. Other permanents with the stated quality can’t become attached to the creature. If the creature has other instances of protection from the same quality, those instances affect attached permanents as normal.