What effect does Coward! have if you target Doji Katata with it?
Coward! + Doji Katata
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.
What effect does Coward! have if you target Doji Katata with it?
Katata's trait prevents him from moving or assigning to attack.
Should you target him with Coward!, his controller could choose to move him to the current battlefield, have the movement effect prevented and fail due to Katata's trait, and then when Coward! checks to see what his controller CHOSE (it doesn't check what actually happened), then no further effects would occur.