Now that Seven Stings Keep is legal, can I use the ability printed on the card, if my opponent has not lost a province, to cause him zero honor loss and than increase the loss with Yogo Honami?
Seven Stings Keep And Yogo Honami
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.
Now that Seven Stings Keep is legal, can I use the ability printed on the card, if my opponent has not lost a province, to cause him zero honor loss and than increase the loss with Yogo Honami?
No. You may use the ability, but there is no honour loss to be increased.
See here and here.
Please use the search function before posting.