Raised by Wolves seems a cut above everything else in the pack. I really don't like Green in BNG though, so I can understand calls to change to either Nyxborn Triton or Fate Unraveler.
I really like Fate Unraveler. He's not really something you need to build around. In a controllish deck, he allows you to play completely defensively while still putting pressure on your opponent. In an aggressive deck, he can push through the last few points of damage just by sitting there. He's a good first pick because he's solid in any deck, though he plays different roles.
He's also splashable, unlike Raised (which I do think is the main contender here).
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He's also splashable, unlike Raised (which I do think is the main contender here).
Practice for Khans of Tarkir Limited:
Draft: (#1) (#2) (#3) (#4) (#5)
Changing to Fate Unraveler