RotN or
Greenleaf could be good. But I see no point of
Sting. You will not have a true choke deck and removing some twilight will not help that much, on the other hand vitality of your ringbearer is much more valuable (as he skirmishes more often and you bid higher) in sealed deck playing.
Hobbit Sword is nearly as good as
Sting and
Frying Pan is way better (and is a common from a small set so chances you get it are not bad).
If you want an anti-Orc card,
Greatest Kingdom of My People is way better, maybe together with
Gimli, Son of Gloin (although chances of getting Gimli, Farin or
Fror are quite good anyway).
Arwen, DoE is not useful in sealed deck, no starter contains Nazgul and they are all U or R, so they will not be played often.
Arwen, Elven Rider is far better (as you never have enough vitality on your ring-bearer, especially as even 3 wounds on him are risky, as you may get hit by
Isengard Warrior's regroup action).