There have been a few occasions where I've gotten a Tarot mission with the "enemy stat increases every X seconds" modifier. The issue? It seems that Calculation is broken; enemies have ludicrously high hp pools or kill you in a single shot from the start of the mission. The HP bug will go away but I'm not sure what triggers it to do so; the damage bug, however, doesn't give you time to fix it because you're already dead. I've attached a screenshot of the hp pool of an enemy in one of those missions.