Some napkin math for Shattered Mask source:

+2A per Contraption from zee dream +13A Print Paper +1A Assassin card =16 Actions

+ 59E in Journals

+ 10E in Broken Giant + 5E in Rostygold - 2.5E in Incendiary + 12.5E reward from Assassination = 84 E

84/16 = 5.25EPA

Pretty good, as long as you can passively get Contraptions while zailing. Plus you can still upconvert/sideconvert the journals for potential rat market shenanigans.