after unlocking the deserter i can safely say that is the worst unlock (i haven't unlocked double baby, maybe is more tedious). its too rng dependant, yes eventually you will get lil loki and spike baby, but that is only if you always choose the hidden option when you dont get them wich means that you will probably won't have a good deck by when you get it. i had to do a whole loop just to get lil loki, and before that i had to be like 20 minutes just reseting until i got spike baby as my first baby.
i hope the deserter is good enough, because it was REALLY tedious to unlock him.