When was Sombra first playable?
Sombra was announced at Blizcon but when was she first playable on the PTR ?
Solution 1:
Acoording to Wikipedia, Sombra was first announced on 11/4/16 and was made playable on 11/15/16.
Solution 2:
While Sombra came to consoles and the main game on the 15th of November last year, she was playable on the PTR the Monday after Blizzcon, mentioned here.