It's still very much a viable option. Ed Ball has been running a pure Fell Beast army on the tournament scene for years now and it regularly performs very well. He won doubles with it last year (1000 points, he had 3 Fell Beasts, his partner had a Moria horde) and regularly places top 3 in most tournaments he enters. I'm not sure which 6 he takes at 1000 points but as others have said I'd swap the tainted for the Dwimmerlaik; the only way to beat the wraiths is with heroes and the Dwimmerlaik's ability is absolutely crippling for them.
I should warn you though, with the advent of the monster rules, the monstrous cavalry boost, the clearly underpriced Fell Beasts and the ridiculous special abilities of the named wraiths this list is broken power gaming at it's worst and the army is no fun whatsoever to play against, people won't thank you for bringing it. I guess you have to balance that against your desire to crush all before you
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Finished 2nd in the 2014 GBHL. My Wife's so proud
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