Well I use Dead Ringer and will never ever stop using it ever. Pretty sure half the TF2 community hates me now 
To be fair, my frame rate is so terrible that I kinda need a get out of death free card to make things fair. Even if it can get you out of every death ever.
Standard Knife, Dead Ringer, The Ambassador. I did have that one knife that instantly turns you into whoever you backstab but I dislike how you lose the standard disguise kit. Plus it has zero synergy with Dead Ringer.
To be fair, my frame rate is so terrible that I kinda need a get out of death free card to make things fair. Even if it can get you out of every death ever.
Standard Knife, Dead Ringer, The Ambassador. I did have that one knife that instantly turns you into whoever you backstab but I dislike how you lose the standard disguise kit. Plus it has zero synergy with Dead Ringer.