Ever since the launch of Witch Queen, there's been no way to get Strange Coins outside of Dares. I think there should be a chance for coins to drop upon completion of playlist activities or else just give more than one coin for a Dare completion. This would give more of an incentive to play with and use 30th Anniversary weapons (like the BXR and Trace Rifle that are getting buffed in Season 17).
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If you want strange coins do the weekly Heroic Playlist