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, 29 August 2009
If my personality is targeted with an action, can I play Final Sacrifice twice and change the target of the same action twice to the same Yojimbo for purposes of playing Ring of the Void? If not, can I play Final Sacrifice twice and change the target of the same action to two different Yojimbo for playing Ring of the Void?
and
My opponent attacks me with a Tsudo no Oni, a Unique personality, and a Pokupo. He targets and destroys one of my personalities with Tsudo's ability, I then target Daigotsu. Can he play Imperial Command to change my target from Daigotsu to Pokupo?
Zen Faulkes (rules official), 29 August 2009
If my personality is targeted with an action, can I play Final Sacrifice twice and change the target of the same action twice to the same Yojimbo for purposes of playing Ring of the Void?
I cannot find a reason why not. If any of the other rules guys can find the rule that prevents it (as I have a niggling feeling there might be), I'm sure they'll speak up.
My opponent attacks me with a Tsudo no Oni, a Unique personality, and a Pokupo. He targets and destroys one of my personalities with Tsudo's ability, I then target Daigotsu. Can he play Imperial Command to change my target from Daigotsu to Pokupo?
If the question is whether Imperial Command requires the new target be Unique, it does not.
A player, 29 August 2009
Regarding this:
If my personality is targeted with an action, can I play Final Sacrifice twice and change the target of the same action twice to the same Yojimbo for purposes of playing Ring of the Void?
I cannot find a reason why not. If any of the other rules guys can find the rule that prevents it (as I have a niggling feeling there might be), I'm sure they'll speak up.
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I think that, if you target the same yojimbo twice with both Final Sacrifices, the second time it wouldn't be considered successful as no target was changed, the game state remained the same as before playing the second Final Sacrifice... You'd have to target two different yojimbo with each Final Sacrifice so each copy of the card actually did something.
Zen Faulkes (rules official), 30 August 2009
Regarding this:
If my personality is targeted with an action, can I play Final Sacrifice twice and change the target of the same action twice to the same Yojimbo for purposes of playing Ring of the Void?
I cannot find a reason why not. If any of the other rules guys can find the rule that prevents it (as I have a niggling feeling there might be), I'm sure they'll speak up.
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I think that, if you target the same yojimbo twice with both Final Sacrifices, the second time it wouldn't be considered successful as no target was changed, the game state remained the same as before playing the second Final Sacrifice... You'd have to target two different yojimbo with each Final Sacrifice so each copy of the card actually did something.
Just confirming that Mamoru's assessment is right.