Many people have been wanting to know how to get strange coins and some people have posted the wrong information . So I am going to clear things up. The most efficient way of getting strange coins is doing weekly heroic strikes. You get 3 coins for the level 22 strike, 3 coins for the level 24, and 6 coins for the level 26 for a total of 12 coins. How ever you can only get the coins [b]once per week[/b]. The other main way is to get a gold tier completion of a public event to get only 1. You can only get those once per day. Its possible to also find strange coins in rare and legendary engrams. The chances are pretty low however. From personal experience about 1 in 35 will contain a coin. Finally you can also get them as a crucible reward but its actually pretty rare. So there you go, hopefully you can get enough to buy exotics.