I run Promethean Code on hard. There are exactly ten taken majors/ultras. It's also useful for things like get 5 kill spree or 5 kill spree with heavy weapons or special weapons (the taken thralls at the start). I actually run this one for a lot of bounties.
If you have a charged agonarch that'll do it- but is a bit more effort.
I used to run around on the dreadnaught- but it's a pain to find which area is spawning taken next.
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If you got the agonarch rune you can use it for the bounty, 3oC can give an exotic and if you don't open the chest you keep it
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Oh, nice tip! I didn't realize you can keep it if you don't open the chest. The chest doesn't give anything useful anyway, does it? So it's worth keeping the darn things charged, I guess.