A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
A player, 4 February 2008
Dark Oracle of Earth Retainer. Experienced. Unique. Shadowlands Open Elemental: Bow the Dark Oracle of Earth to give one of your Provinces +5 Strength, turn any face-down cards in the Province face-up, and permanently give them the Shadowlands trait. You may do this in a battle in which you have no units. Lose 4 Honor. This loss may not be copied or modified.
Isawa Osugi Phoenix Clan Prodigy. Shugenja. Unique Any effect that gives Osugi the Shadowlands trait is cancelled and has all effects negated. Isawa Osugi cannot have more than one Spell attached at any time. Spells have their Gold cost reduced to 0 when being attached to Isawa Osugi.
If I use the Dark Oracle ability on a face down card, and turns Osugi face up, will she turn back face down?
Zen Faulkes (rules official), 4 February 2008
If I use the Dark Oracle ability on a face down card, and turns Osugi face up, will she turn back face down?
No. Negation never undoes already resolved effects.
A player, 5 February 2008
RE: This
To avoid confusion, I would like to point out that while the above ruling is correct, the reason given for it is not.
Zen's assertion that "Negation never undoes already resolved effects" was a rule in Lotus Edition, but is no longer true in Samurai Edition (see here).
The actual reason the above ruling is correct is the following:
http://rules.l5r.com/Effects#Negating_effects: "If “all effects” of an action or trait are negated partway through the action or trait’s resolution, instantaneous effects that have already resolved are not undone, but ongoing effects that have already resolved are negated."
Zen Faulkes (rules official), 5 February 2008
RE: This
To avoid confusion, I would like to point out that while the above ruling is correct, the reason given for it is not.
Zen's assertion that "Negation never undoes already resolved effects" was a rule in Lotus Edition, but is no longer true in Samurai Edition (see here).
The actual reason the above ruling is correct is the following:
http://rules.l5r.com/Effects#Negating_effects: "If “all effects” of an action or trait are negated partway through the action or trait’s resolution, instantaneous effects that have already resolved are not undone, but ongoing effects that have already resolved are negated."
Yes, should have clarified "instantaneous effects." Sorry.