Evident's Comments
Balance Change Update 6.1.3 - Nerfs to Yogg-Saron, Tuskarr Totemic, Execute, and More is Live!
Here’s a response from Ben Brode: “There is a rare edge case where your collection will show you have an extra copy of a card that you don’t actually have. When players tried to disenchant that extra copy, it would dust the copy that they actually wanted to keep. We’ve added some protection against this. Sorry for the confusing patch note!” Source: https://www.reddit.com/r/hearthstone/comments/55p2kw/hearthstone_update_october_3_2016/d8cg2u8
Balance Change Update 6.1.3 - Nerfs to Yogg-Saron, Tuskarr Totemic, Execute, and More is Live!
You should disenchant it for now and see if it stays in play. You can always craft it again since you get a full refund.
RayC's Yogg Tempo Mage - Top 5 Legend (September 2016, Season 30)
Ragnaros or second Mana Wyrm.
Puffin's Yogg Control Warrior - #2 Legend (September 2016, Season 30)
Second Bloodhoof Brave and Blood to Ichor.
RayC's Yogg Tempo Mage - Top 5 Legend (September 2016, Season 30)
Second Mana Wyrm and Ragnaros could work.
Tom's Legend Medivh's Valet Aggro Freeze Mage Deck List Guide (September 2016, Season 30)
Probably too important to replace.
Beast Druid Deck List Guide (September 2016, Season 30)
Mounted Raptor or second Tiger.
Dog's Arcane Giant Miracle Rogue (September 2016, Season 30)
If you want to play Rogue you’ll need double Prep.
tholwmenos' EU #1 Legend Dragon Warrior (September 2016, Season 30)
Warlock is the top priority, and then Hunter, Druid, Mage, etc.
Muzzy's Legend Midrange Shaman (October 2016, Season 31)
I’d try second Feral Spirit.
Reynad's Tempo Rogue w/Swashburglar (August 2016, Season 29)
Deadly Poison maybe? That’s a tough one to replace, he’s a big piece of the deck.
Thijs' Anyfin Murloc Paladin (October 2016, Season 31)
Second Forbidden or regular Ragnaros.
Reached Legend.