I'm feel your pain, I just spent 66 strange coins to get 45 ToC and some heavy weapon ammo and like an idiot used four each run and got only 1 exotic helm engram that turned into Helm of Inmost Light which I got last week. I don't have very many strange coins so I'M the ToC are pretty worthless now. I wish I'd spent 46 of my stage coins on 2 legacy primary engrams instead. Will try to farm for strange coins later to get at least 1 or 2.
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Farming for coins is slightly easier - most times they'll drop from chests on the dreadnaught, or you'll get them from daily missions.
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Use 1 per strike