This was a Custom Team Color I made. I always felt that Neon Yellow, when mixed with black, appears very ugly.
If for some reason you import this via a file path yet this does not work, then simply use it as texture for a model. Share me your input if you know how to make this playable in-game, because I honestly tried.
If you want to experiment and enjoy, A Void has his own Custom TC system. I used it, and it's much fun! Give him credit.
Credits to Blizzard Entertainment for the original Texture.