The idea is good. But there are a lot of opportunities for spectators to make you really hard time
trying to get the cards in final order.
I mean what if spectator names such numbers as 9 to 15?
Or even to 25? Who own it - will understand.
And Adrian just didn't discuss it.
So if
spectator will name 30 to 49 - it's a good trick, if a smaller number - pain in the ***.
Also it
requires a spectator management in general.