This is an exceptional effect, but requires practice with Dani Daortiz’ style.
The
principle taught IS entirely impromptu. The phone aspect can be replaced with anything (just showing
them cards). If you use a mat, this is also impromptu as shown in the video.
Dani Daortiz
isn’t for casual hobbyists. Those who are practiced with the type of magic, will find the technique
in this effect phenomenal.
You truly can let people THINK of a card if done correctly.