I play the daily bounties on crucible every day I I don't get jack! During iron banner I even got to rank 5 and out of all that I got timurs lash... That's all I got from getting to rank 5. Will rng ever be nice to me!?!
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Your best chance to get rewarded is Raid Nightfalls (high exotic drop chance) Weekly heroics (for strange coins to buy from Xur) Other than that prepare to be disappointed and get blue drops with occasional purple drop that will inevitably decrypt to ascendant mats.