You can gain strange coins by collecting engrams and turning them in sometimes they turn into strange coins. You can also try doing some regular strikes and crucible in hopes of getting them by drops that way as well. Remember that it is all RNG base so there's no guarantee. If you do not have the expansion then unfortunately you won't be able to get the strange coins from the weekly heroic. Hope this resolves your issue.
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Thanks this has helped a lot. Do you recommend the HoW dlc?
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No problem if you have not purchased any of the DLC's from year one I highly recommend you get the Taken king bundle pack. You will get all the new content plus the previous DLC. The Legendary edition of the taken king would seem like that best bet. If you are still playing the game regularly and enjoy it then that is your best bet.
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Ok thanks aloy