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, 23 July 2007
About this thread:
viewtopic.php?f=59&t=59400
What about if the opposing player have not gold enough to pay a Hired Killer against the re-targeted personality?? The actions obviously fails, but, must he pay any gold, or zero??
Would it be the same in SE??
Thanks,
Martin Lund (rules official), 30 July 2007
Costs must be payable when an action is announced under the Good Faith Rule. If, due to interference from other effects, a mandatory cost cannot be paid at the point when it must be paid:
* No remaining costs need be paid, but costs already paid are not refunded. * No effects of the action or trait resolve, and the ability or trait is considered to have been “used.” * If the cost was for a card to enter play, it is discarded.
If you get to the Cost Payment step and suddenly you can't pay the Gold Cost because someone bowed one of your Gold Producing Holdings or messed with targeting, you don't have to pay the remaining costs.
So in this case, if you can't pay enough Gold to kill the target you don't pay any Gold.