A Modern, Commercial, Easy To Do Variation on The Classic Berglas Effect - Any Card At Any Number 

Effect- The magician (Surprise, that's you!) takes a deck of playing cards from his pocket, and places them face up on the table explaining that there is a Holy Grail for magicians, where one spectator is asked to name a number between one and fifty-two, and another is asked to name any playing card.

The cards are then counted down to the number chosen, and to the amazement of all around... the chosen card appears at that random number... The crowd goes wild with applause at the sight of this seemingly impossible feat, and the magician leaves them wondering "how did he do that?"!

The magician then continues to explain that unfortunately, there are only a handful of performers who can achieve this miracle - and he is not one of them! 

At which point, a number is selected by Spectator A and said out loud, for the benefit of the rest of the audience. Spectator B then chooses any card out of the 52, and again says it out loud.

For the first time since tabling the cards, the magician picks them up, spreads through the deck, to find the named card and removes it from the remaining cards.

All the other cards are turned face down, revealing that each one has a different number printed on the back... and turns over the chosen card to show that it has the selected number on the reverse!

Notes:

There is no Stacked Deck (If you wish, the cards can be shuffled by a spectator)
Only 1 Deck of 52 Cards are ever used
The trick is instantly reset and repeatable (Great for table hopping)
There are no difficult memory systems
No additional gimmicks are used
No Rough & Smooth, thick, long cards or similar
No pre-show work
No stooges or instant stooges
Can be performed to just one person selecting both a number and a card
No subtle uses of NLP etc
The choices are truly free
All the writing is on the reverse of the cards
The Person's Name or Favourite Animal Could Appear On The Card Instead
Literally 100's of variations are possible using this method & approach