I don't envisage my players picking up fortune cards. The power creep issue isn't a problem for me provided that it players out at the level of encounter design (like the 2 solo dragons encounter described above). If it starts to affect the design of individual monsters, that will be a different matter.
(Btw, I am one of those who is finding that the monster boost in MM3/MV is a good thing, independently of fortune cards.)
(Btw, I am one of those who is finding that the monster boost in MM3/MV is a good thing, independently of fortune cards.)