So I finished the Nightfall and got 5 Three of Coins. (rare consumable)
"Stackble effect that increases the chances of the next Ultra you defeat will drop an Exotic Engram."
Anyone know where and when I should use them to get the best out of them.
Update: Used all 5 coins before I killed heroic strike boss undying mind, and I only got 3 blue engrams.
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shield brothers vanguard heroic