Problem:

List1 (column B) contains a range of alphabetically sorted letters.
We want to create a randomly shuffled list of the same letters in column C.

Solution:

Enter the RAND function as shown in each of the corresponding cells in column A:
=RAND()
In column C, use the VLOOKUP, LARGE, and ROW functions as shown in the following formula:
=VLOOKUP(LARGE($A$2:$A$9,ROW()-ROW($C$2)+1),$A$2:$B$9,2,FALSE)
The list will reshuffle with each recalculation (