Spy is one of my favourite classes 🙂
YER is extremely effective with the Saharan Spy set + Dead Ringer.
I also recommend looking at Stabby’s Scripts (just search them up on the internet), they are handy scripts for the spy, such as hiding the viewmodel of the ambassador, which takes up half the screen when reloading.
Another thing to improve your spy game is to learn how to detect and deal with paranoia, as the more you backstab, the more on-edge the enemy will be and they will be afraid to be backstabbed, and will check their backs and spycheck more often.
An example of dealing with paranoia would be to wait until the enemy is in hard combat (Eg. heavy medic combo shooting at your teammates), then go for stabs, rather than go for stabs when the enemy is not in combat.
If your team is paranoid, try to avoid friendly scouts on your team, as they can attract lots of attention. They will be using the same side routes you’ll be using to get around the enemy team, and this will draw more attention to your side routes.
When you get your fundamentals of spy right (Eg. Spotting out a possible stab, learning about paranoia), you can learn the trickstabs. These are advanced stabs which are hard to pull off. I’m not sure if this is all of them but the ones I know are:
Matador- Where you are front on against an enemy trying to melee you, you go one direction, they turn towards you, then you quickly dart to the side and stab them.
Corner- Enemy chasing you, you wait at a corner, they round the corner, you dart to the side and stab them in the side.
Stairstab- Enemy chasing you (yet again), you go up stairs, they follow, you leap backwards over them and stab them in the back.
I’m not too good at describing them, you may have to look up youtube videos of the trickstabs for yourself.
Good luck at playing spy!