Basically I'm after the warlock gauntlets from this strike and despite doing 20 strikes in the regular playlist and a half dozen in the Heroic playlist, I've yet to have the Echo Chamber strike appear so I can use the Skeleton Key chest to get said gauntlets. Is this strike even in either Siva Crisis playlist? If neither, is the skeleton chest in the version you select from the Director or am I just gonna have to grind it until the RNG Gods deem me worthy of their gifts?