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.
Can Asahina Keigo use a copy of Singh Remnants that starts in your hand to essentially pay for itself?
Keigo's ability:
Reaction: When paying a Gold cost, bow Keigo and discard a card: Produce Gold equal to its Focus Value.
Singh Remnants ability:
Political Reaction: After your performing Personality enters play, if this card is in your hand or discard pile: Attach this card to him, paying all costs. Gain 1 Honor.
Can Asahina Keigo use a copy of Singh Remnants that starts in your hand to essentially pay for itself?
Keigo's ability:
Reaction: When paying a Gold cost, bow Keigo and discard a card: Produce Gold equal to its Focus Value.
Singh Remnants ability:
Political Reaction: After your performing Personality enters play, if this card is in your hand or discard pile: Attach this card to him, paying all costs. Gain 1 Honor.
No.
Essentially, Singh Remnants isn't in your hand to be discarded when you try to pay for it with Keigo's Reaction.
See Card types, Playing attachments for more information. In Step A the card leaves your hand and in Step D you need to try to pay for it.