KelThuzad for me is too slow and rather pointless. If you manage to play big legendaries in consecutive turns and your opponent can't clear them then KT is pointless as it's probably already over for him but if he does then KT is a basically a vanilla 6/8? It's basically a win more or ensure win card if you already have a big lead otherwise it's much less effective. I would rather have another Sludge Belcher in there, that card is a beast!