I think the one big upsides of Lana'thel and one that a lot of people tend to forget is that her ability is not a battlecry. This means that you can use Cruel Dinomancer to resurrect her if you discard her and still get the +attack. Currently discard only works in aggro but if we get enough support and a slower discard deck becomes viable, Lana'thel will be excellent in it.
Yes, as for stat, the card is very good, it works pretty well with discard since its not a battlecry. Yeah , if blizzard gives support to discard mechanism.
I've got her as well and used her in a discard deck. First soulfire I cast, she was discarded from my hand..... yeah I quickly deleted that deck.If her card text read something like "cannot be discarded" I think she'd see play but she is a pretty dead card considering she has to 'survive' multiple discards in order for her to be worth it. The odds of that happening are quite low.