How to turn a card over in a deck?

[JayPolo]

Any source where I could learn a nice way to turn over just one card in the deck?

I want this to complete my routine but sort of short on ideas.

Thanks!

 

[RealityOne]

There are lots of ways to do this: https://www.conjuringarchive.com/list/category/1170

The simplest way is Mark Wilson's Automatic Card Discovery (page 31, Complete Course in Magic). There is a whole chapter on "The Reverses" in Royal Road to Card Magic.

Ultimately, the method depends on the context of the effect.