Auras and equipment that grant keyword abilities use a slightly different wording than instants,sorceries, and other effects that do the same. See Aerial Maneuver versus Spectral Flight. This and other Auras in your set need to read "Enchanted creature has [keyword]," not "gains." The two are actually interpreted differently by the rules.

While that may be technically true, I don't think Sorrow particularly has to care about that level of detail. Especially in a set that I think is before its first playtest, worrying about that kind of templating tweak seems slightly misplaced unless the cardset author has specifically asked for it.

(If Sorrow has asked for templating advice and I missed it, of course, feel free to ignore this comment or let me know.)

I made the comment because it's general information about which the cardset author seems to be unaware. It's not my intent to be malicious. I always feel that it's in everyone's best interest to know as much as possible. If no one informs a person of something, it's possible that that person will never learn that information.
Of course, if my comments displease Sorrow, I will gladly stop.