so what you do is play heroic strikes until you get the sheild brothers, and this is where the process starts. you kill the red guy that runs around trying to kill you and pop a 3 of coins before you kill him. once he is dead just wipe and kill him over and over. me and 2 friends did this and everytime we got him to drop an exotic, he dropped 2 instead of 1. got about 15 exotic engrams in about 45
minutes