Looks like Rockstar accepted Pharaoh. Luckily, I only C&P'd my Yamask Challange, but I would have personally picked Vengeance for a challenge. :3 Yours is quite interesting too though, don't get me wrong. ^^
Hahaha, ah well! Let's both give him/her Yamask challanges, and they can pick the one they want. Also, get rid of the nature restriction, since it's random, and they'll probably be hunting for a Calm Yamask for a good while of time.