I'm sorry, but AS A MAGICIAN, you need to think before you perform.
A spectator doesn't see the time you put into it. Also, your description, compared to mine, say the same thing with different words.
How many times have you spread a deck of cards only to have a spectator say "I know this one," or "I've seen this one"?
Pulling a card "out of thin air" is still just "finding their card."
The basics of your routine, even in your own words are, they choose a card, it is lost, and you found it.
As far as pic a card, find your card effects go, you REALLY have to be innovative for it to be something not "seen by everyone."
Honestly, a colour change would be something see by far less people.
I"m not saying your effect is bad, just it's not something I would consider to have not been "seen by everyone" in the eyes of an audience.
Then again, something not "seen by everyone" is often not going to be a go to effect. These will generally be proven classics that are eye catching. Then again, what defines not seen by everyone? Many "classics" have not been seen by most audiences, especially not in person. However, nearly everyone has seen someone "find their card."
Still working on that whole 'taking criticism' thing I see.