The fact that they slipped this change into the game without refunding every single card that discovers shows they don't want people to even know it happened. Because it's indisputably a nerf to cards like Frost Strike, Hematurge, Necrotic Mortician, Amalgam of the Deep, Nerubian Vizier, Paparazzi, Hipster, and Ghost Writer.
How is the average player supposed to even KNOW the mechanics for discover have massively changed?
It also doesn't even make sense. I don't even think they thought through the ramifications long term of this, it's just a slap dash fix to try and weaken DK when they should have been weakening the cards themselves. (Oh that's right, might have to refund in that case)
They have now instituted two shadow changes with discover as nerfs that were never communicated in game:
1. Discovering DK cards can't discover triple runes
2. Cards cannot discover themselves
Why should discover be like this? Because you "shouldn't be able to get extra versions of those powerful cards"? Ok, but why can you discover extra legendaries of cards you included in your deck normally. Why are extra DH relics allowed to be discovered? And yet certain other cards are banned from discover pools like, say, the second Cthun. They need serious consistency on the design here and it seems like they're going in the other direction.
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Damn man, I really want to thank you for this deck! Have not had so much fun in a long time! Almost no one sees the combo coming and apart from some other combo decks that gather their combo pieces quicker I haven't really encountered a hard counter.
I do have to agree with SirSeltzer regarding his card changes, they do really make it play better / easier