My evolve cards have suddenly dissapeared from my shaman deck and I am a bit peeved because I dusted so many cards to make this deck and now I cant play. 
The temporary wild cards rotated back to wild today. That includes Evolve.
My deck IS wild… So what they are gone forever and need to craft 2 new ones?
If you were using the special cards that the event gave you, yes. If you did have these cards in your collection before the event, then you should be able to find them again in your collection.
Sylvanis Windrunner dropped out of my wild deck and even though she shows as part of my collection I cant put her back
Oh. Why does the game never explain that these cards are temporary? When I read event I thought I gained them through in game achievements or something.
It did.
You read wrong.
I think they should have made it clear that the cards are leaving - I only vaguely remember 1 notification in-game. They do this pretty well with other events like the Fire Festival and special Arenas.
If you follow updates outside of the game, you might already know that the cards would be leaving 5 December when the new patch hits. This was also on the forums: Wild Cards rotating out of Standard on Dec. 5
However, no mention on PlayHearthstone news beforehand, and some mentions on Twitter and Reddit instead.
https://youre.outof.cards/media/uploads/ee/7a/ee7a6e47-bf02-4e52-853a-50012bc12f0c/hearthstone_screenshot_10-08-19_130531.png
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Read what wrong? The card text only states “event”. The hell am I supposed to get out of that vague description.
The first time you logged during the event, the game mentions the cards are temporary. A few days ago there was another pop-up warning players these cards were going away soon. You were told these cards were temporary, you just weren’t paying attention.