thats right. i was thinking about normal danger gains due to attacks. but as an exchange of foj hn usage lke you said would be good. not make much differences if you have tons of fleets but still + to prevent some of your loses.
Im completely focused on william one eye and captain dungeness' s port wide danger increase voodoo suggestions. and when i read this one after them i thought this one (as a legendary all fleet wise and casted by others) would be a good counter for that voodoos.
make 1 uncommon card: mostly newcomers or less ship owners will get benefit from that one
Affect only 1 fleet
only castable by fleet owner
make 1 legendary card:
affect all fleets
can be castable on others,
when decoy gets attacked original fleet will also lose danger.