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.
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Similar to the current discussion on Seeking the Way. If the Estate calls out My Lord's Favor, will this stop me from even announcing it, as I now that I won't discard the favor and therefore will be unable to fulfill the targeting? Or am I actually forced to use the first Action when I announce to play My Lord's Favor as I am able to do so?
Similar to the Seeking the Way, this is pending discussion.
Per the reversal on Seeking the Way, you may announce any abilities on My Lord's Favor regardless of negation interferring with the mandatory targeting or Favor discarding.