That's common for regular strikes. Try nightfalls and you might get some legendaries.
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For 30+ with NO legendaries? I know something else has to be up. Last season I ran playlist strikes to farm the GL and Rocket and was having legendaries drop all over the place. Also, catalyst is supposed to drop from playlist strikes, and it hasn't yet.. again- 30 strikes.
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I got the cat for arbalest but honestly don't remember if it was from strikes or nightfall. As far as you not getting anything after 30 runs, can't say much about that, some people are swimming in loot, others can't buy even a legendary