Will Nax become unplayable? Or just unbuyable?

[Copperbad 5]

Just getting back into HS, and I'm a bit confused about how adventures are going to get rotated out of Standard. 

If I already own Nax, will I still be able to play it to acquire all the cards (for use in Wild) or do I need to complete it before the Standard rotation goes live?

[positiv2 953]

Blizzard said that you will have the option to finish Naxx if you have at least one wing.

[Copperbad 5]

Thanks :)

[Valkyr 55]

While blizzard has said you can buy naxx if you have one wing, I am not sure If you will be able to still get the cards from finishing it.