Just a quick reminder – patch 22.4.3 was released on March 3, 2 weeks ago. It was a small balance update with only two cards getting nerfed, but both of them are eligible for full Dust refunds.
After a card gets nerfed, you can disenchant it for its full crafting cost. The grace period ends 2 weeks after the patch – in this case today (most likely around 10 AM PT / 18:00 CET, since it’s the regular patch time). Keep in mind that it doesn’t apply to buffed cards.
Here’s a full list of cards you can Dust with the amount of Dust you’ll get for them:
If you own a Kazakusan, especially a golden version, it might be worth getting rid of him if you don’t play him right now. The card is – obviously – still good, but we’re just before a massive rotation and it’s hard to say what the meta will look like then. The same goes for SI:7 Smuggler – it’s also playable, but only good in a single specific deck, Questline Rogue. If you don’t play Questline Rogue, there’s really no reason to keep it.
Keep in mind that even if you will want to play some of those cards in the future, disenchanting it shouldn’t be a problem. You can Dust them now and then re-craft them later if you need them (and if you don’t – that’s free Dust in your pocket). If you don’t care about Golden versions, getting rid of the Golden and then crafting a regular one is also a good deal (you still own the card, but you’re ahead on the Dust).