891732 Chen is a polybag released in 2017. It contains Master Chen along with a red snake, a lime snake, and two fang claws. It was included in issue 32 of the Ninjago Magazine.
Designer's notes
"I don't remember making this magazine set but I made all the others of this series... I'm pretty sure I made this set. Bonus snakes seems like something I would do."[1]