I saw a shitposty game with the premise "a lone angel is sent to kill Satan" and, like.
I haven't played it, but setting aside the goofy context, "a lone angel is sent to assassinate the Devil" sounds like exactly the kind of impossible mission which is given to a clueless subordinate in a conspiracy thriller where their superiors are intending for them to fuck it up and die in the process, because this was all part of some grand plot to like Keep The War Going Forever or what have you, and they're banking on Satan's response to the assassination attempt.
But, like, this mission then becomes the inciting event that results in the protagonists uncovering and overthrowing the conspiracy, precisely because the quality they were looking for in their patsy was "genuine ignorance" rather than "willingness to die for The Plan", and the would-be devil-killer (or someone else who's aware of the mission but isn't in-the-know) started asking inconvenient questions. That, or the conspiracy's plans are completely thrown for a loop when, against all odds, the mission actually succeeds.