From Open PTR I have been very vocal about this. I had created many threads and a lot of posts about Discard and what kind of balancing that is needed. Discard is the most disgusting mechanics in the game. With so many tempo generation options and possibility to thin to 0 easily, they can plan for any combo and will always get it. Even if there is a 3 or 4 cards combo, SK can achieve it (the cards may be locked or killed, but they can do those combo without any problems). They kind of balanced Derren which was kind of fair (2 power and 8 provisoins) but then saw SK people not liking it and hence immediately in the next update, they brought in another OP discard card, Coral. The funniest thing is, in the stream, Jason told that SK has too much consistency and hence they want to put them in leash, but what they did was exact opposite, with Coral change.
The one thing which that needs to be done is, balancing Morgvarg. He provides +5 tempo through a single card. His ability is almost the same as Roach (or I would say even better and easier). He should have only 3 power and 9 provisions. The free on demand tempo shouldn't be 5. If that happens, then I think Discard would be kind of OK. But I don't think it will happen.
[Imagine if Aelirenn gets summoned by 3 elves on board. There would be roar of disgust from the community saying it is so easy and an auto-include, etc. There will be no reason why anyone will not add her in the deck. Morgvarg is the same, but CDPR has a blind eye towards Discard. For the same kind of tempo, other factions will have to suffer a lot, but Morgvarg can be summoned by a bronze card or by a leader and can be on demand. That IMO is disgusting and broken].