I have King Krush but cannot select it for the classic hunter deck. I have the option to craft it again as a classic card but that should not be nessasary i suppose
The king crush you have…is it a core card? If so, that’s part of a set that Blizzard gives us for free to use during a standard rotation of 1-2 year but it’s not part of our personal collection meaning it can’t be used in classic.
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Thanks for answering. I can use it in a standard deck, so i guess you are right. For me it is still confusing.
Well. Blizzard could have made it more visible which cards are of the core set and which are not 
The core set was introduced as a free rotating set available to all players so that no matter the size of their personal collection they would still have access to some usable cards for standard, wild and duels. Classic only allows cards from the classic set and those need to be collected as other sets. Because Blizz wants our money
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