Cards like Braids challenge the player to use extra effects to make symmetrical effects more one-sided, and blue offers plenty of such cards
In general, I would look at these two factors when looking to include cards not of your tribe's creature type: Is this creature so strong that it, on its own, is generally stronger than my tribal creatures when they are receiving bonuses and/or empowering my other cards
But Dark Confidant really shines in life loss decks like Rowan, Scion of War and sacrifice decks that can easily get you out of the Bob business when you need to
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I chalk this up to my love of "engine" cards, cards that allow you to turn one resource into another
You cant gain life, but more importantly, you cant lose it