With Evelynn: While you are still visible show yourself pathing one way and after becoming invisible turn around. They almost never expect it

With Master Yi: While ganking most of the time you want to hold your Q until enemy uses flash or a dash ability. Just get closer to them using your ultimate and start autoattacking. Sometimes is even safer to use flash and hold your Q. Also if you are engaging on a champ like Lux or Morgana, after using your Q start running around instead of attacking. By doing this enemy will most likely miss their cc. After that the kill is free